When the Murrumbidgee river in New South Wales started flooding, towns like Wagga Wagga evacuated most residents. However, they weren't the only ones with a contingency plan. In a process called "ballooning," the crab spider uses long strands of its silky webs to travel through the air like a screaming, eight-legged Phileas Fogg. They set out on this airborne journey when they mature and start to feel stifled by the tens of thousands of siblings they have to compete with. So when a flood threatened the habitat of several of these spidey clans, they all strapped on their self-made parachutes and migrated to wherever the current took them. Which turned out to be Wagga Wagga.

Reuters

And on May 4, 2015, the remaining residents of New South Wales woke up to find millions of crab spiders paratrooping into their village. Before long, entire villages were covered in spider webs so massive that they looked like they were designed to catch dinosaurs. But if spiders can mummify entire villages, how come we're not all speaking arachnid?

Luckily, these crab spiders are one of few Australian arachnids that can't kill someone just by looking at them. The younglings can't even break the skin with their bites. Like any adolescents, their nuisance was mainly TPing a bunch of houses and loitering around outside in large groups. Still, we have to salute Australians for their casual reaction of slight annoyance to this phenomenon. Most other people who see a cloud of spiders rain down on them would probably burn the country to the ground and try again elsewhere.

Daniel Munoz/Reuters

Speaking of ...

Of all places, Ireland would probably be the least surprised if whiskey started streaming through the streets like it was part of the natural environment. The only thing they would have to worry about would be the biggest collective hangover since the day before. But in 1875, Dubliners found out that the national spirit could damage more than their livers when an actual river of the good stuff came rushing through their city, setting everything on fire.

Illustrated London News

Right after 8 p.m. on June 18, 1875, people noticed flames in one area of town. The cause was quickly ascertained, as 1,800 barrels' worth of flaming whiskey came pouring through the city. Onlookers compared it to a stream of lava -- if, instead of killing you, drinking lava would make you sing sailor songs and cheat on your wife. The single-malt stream set fire to everything it touched and left people fleeing for their lives. Kind of. A healthy amount of Dubliners didn't want to waste the free booze, so even while fleeing, some people couldn't help trying to "capture the precious liquid before it went to waste" in anything they could, including hats and boots.

via Come Here To Me

At first, firefighters tried to put it out with water, but mixing whiskey and water only made it worse (looking at you, lightweights), and the fire spread even faster. Fortunately, like every other city in the 1800s, Dublin had literal shitloads of manure lying around, which they used to build dams to stop the fire from moving through the streets, halting the streams enough for the fire brigade to douse them. It wasn't until the day after that things had calmed enough for people to return to their homes and assess the damage. The "Great Whiskey Fire" was one of Dublin's most destructive blazes ever. Still, the police and fire departments were praised for their amazing response time -- it was almost as if they had arrived at the river of booze before anyone had reported that it was on fire. Amazingly, not a single Dubliner died from the fire or smoke. Thirteen of them did die from chugging burning gutter whiskey, though, which remained poisonous even in the hardened stomachs of 19th-Century Irish alcoholics.

Oh, look at that. Australia again. What a surprise. In the Darwinian nightmare that is Down Under, even the weeds can challenge us for dominance. The evocatively-named "hairy panic" (panicum effusum) is not what happens when someone finds out that their Brazilian waxer is going out of business. It's the mass buildup of dried brush, like giant fuzzy tumbleweeds. Which sounds all quaint and rustic, but looks like the first act in every movie set 200 years after the apocalypse.

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Because of increasingly dry weather, this dead grass spreads like (though it fortunately doesn't cause) wildfire. It only took a single farmer forgetting to secure his derelict paddock for waves of hairy panic to fuzz over the Australian city of Wangaratta. The plant which makes the tumbleweed is so fast-growing that the tumbleweeds can easily stack up to roof height, with some residents having to remove them multiple times a day.

After numerous complaints, the local council had to admit that they couldn't do anything to stop the invasion, other than hope for a strong wind to carry the tumbleweed over to the next town. A spokesperson told a newspaper that there wasn't much that could be done "from an enforcement side of things," that the council had a "very limited capacity to intervene," and that it was not something they "can stop from happening." We like to think he made this speech with increasing panic in his voice as the brush slowly built up around him.

Rick Wilking / Reuters

But while the weeds are relatively harmless to people and pets, they are very poisonous to sheep, causing swelling of the head, jaundice, and liver damage. Or as the Australians call it, "yellow big-head." Because you need to create as much whimsy as possible when living in a place where Mother Nature tries to bounce you on a daily basis.

The only way fog could be tied more to the city of London is if it were obscuring Sherlock Holmes's vision while he tried to find a Dickensian orphan stuck in a chimney. But it turns out that London never really suffered from fog so much as it had a really bad smog problem. Like, "modern-day industrial China" bad. Yet for centuries, Londoners would grit their teeth (which is what smog does to teeth) and welcome the change of pace from inhaling pipe tobacco and horse s**t particles all day long. But in December 1952, everything got taken to a new level as the smog started choking people. To death.

Hulton Archive/Hulton Archive/Getty Images

The Great Smog was a perfect storm, almost literally. During one of the country's harshest winters, more fires had been lit than ever before, producing an unmanageable amount of smoke and coal dust. At the same time, above the city, a weather phenomenon called an anticyclone (which is also how Jean Grey describes Wolverine's lovemaking) had formed, keeping fresh air out of the area.

Before long, visibility dropped to a few yards. Two days later, it was one foot. Since no one could see, cars had to be abandoned in the middle of the road and people fell into the Thames and drowned. Then the pollution starting mixing with water in the air, turning into sulfuric and hydrochloric acid and making the air toxic to breathe. Since ambulances couldn't get out, people had to walk to hospitals, with their lips turning blue from asphyxiation along the way. Within a week's time, 12,000 people had died. But the government, embarrassed that they had ignored those crazy pre-hippie environmentalists who had protested in the 1920s, insisted that most of the dead had merely caught a really bad flu.

BBC

The worrying part is that this negligence was by no means an isolated incident. As far back as the Civil War, Pittsburgh looked like God had trapped it under a shot glass and was blowing cigarette smoke in. Author Anthony Trollope described it as being "the blackest place which I ever saw" -- and not in the cool "great jazz city" kind of way. The reason people simply accepted living in a cloud of lung cancer was the progress it signified. Since people considered lots of smoke to mean lots of lucrative industry was happening, no one really worried about it until after World War II was over, when new environmental laws finally turned Pittsburgh into that garden paradise it is famous as today.

As the population of New York City skyrocketed in the 19th Century, 100,000 to 200,000 horses were brought to the Big Apple to transport this steaming heap of humanity. What people didn't keep in mind was that each of these equine convertibles produced 15 to 30 pounds of poop a day (plus a quart of urine). That waste was spread all over the city for pedestrians to try, and usually fail, to avoid. But what they could never avoid was the gigantic cloud of"pulverized dung" that coated the city like a disgusting Ferrero Rocher.

But the living horses were not the biggest waste management problem the city faced; that would be the dead ones. It was commonplace for horses to get sick or collapse from overwork. In 1880 alone, New York City had to deal with 15,000 horse corpses littering its streets. And if a particularly heavy specimen keeled over on Broadway? Then it was easier to let it stay there until it had rotted enough that it could be taken away piece by piece. The smell of the decay wasn't just unbearable; it was also lethal. About 20,000 people a year died from livestock-related illnesses -- which, if you're keeping score, means that more people than horses died from horse sickness.

via Collectors Weekly

Eventually, the city decided that something had to be done. They came up with an ingenious plan, which was to clean up the mountains of crap from time to time. It's amazing how it only took them about a century to figure out that gem. The city created a new, curious governmental branch called the Department of Sanitation, and sent men completely dressed in white (at least for the first two minutes of their shifts) to sweep the streets. Shockingly, these "White Wings" really helped turn around the city's health problem. Here's a comparison of two streets before and after people decided to start picking up their s**t:

via Collectors Weekly

So if 1800s New York was the goddamn River Styx, then 1950s New York was, well ....

Weed was everywhere, particularly in Queens and Brooklyn. Some plants were "as tall as Christmas trees," which would be one way to get your racist aunt to chill the f**k out over the holidays. From underpasses to vacant lots, large cannabis plants were commonplace, soaking in the sun and a steady diet of antiquated Brooklyn profanity.

But while a lot of the sticky icky had been planted by enterprising beatniks, the real reason the plants were able to spread all over the city was sweet, sweet innocence. New York's pot plague was mostly due to the Greatest Generation not being to tell Mary Jane from any other weed growing in their backyard. Imagine if your stoner friend -- the one who convinced his mom that the plant in his bedroom was just ivy -- was put in charge of a city. That was New York in 1950. By the time the city wised up to what was going on, hundreds of thousands of plants had sprouted throughout the boroughs, creating a veritable jungle.

Brooklyn Public Library

But that changed in 1951, when the sanitation department decided to ruin everybody's buzz. During that summer, the city dug a whopping 41,000 pounds of weed out of the ground. John E. Gleason, the Sanitation Department's chief inspector, targeted most of the biggest "marijuana farms," including one that was growing right in the middle of the land set aside for a future civic center, but many smaller growers got away with their hauls. Still, the amount of weed that was destroyed was estimated to be worth almost $6 million (or to put it in terms fans of this entry can understand: two million bags of Cheetos).

Brooklyn Public Library

After getting his fancy photo ops showing him overseeing his workforce in a crisp white suit like some kind of plantation owner, Gleason took all the weed to Queens, where it was incinerated. 41,000 pounds. Incinerated. No one in Queens can remember the summer of '51 at all.