So the economy has been canceled, and no one can afford to eat anything other than canned soup and the occasional box of macaroni and cheese. But you can cheer yourself up with the knowledge that some day, people in fancy restaurants will pay top dollar for the food found in the average dorm room or trailer park.
How do we know? Because many foods that we now consider to be classy and/or expensive were at one point the foods that meant Timmy probably wasn't getting that new foot for Christmas. So in a couple of generations we'll see who is laughing about our tower of Noodle Cups.
It's no surprise that lobster didn't use to have much of a reputation. It is, literally, a sea insect. The lobster belongs to the same animal group as both the spider and the common bug, which should be your first clue. They were initially thought of as giant hassles that got in the way when fishermen were fishing for, you know, fish. You know in Forrest Gump when they first pulled up their nets and a bunch of junk fell out? The lobsters were the equivalent of that toilet seat.
The lobsters they presumably found crawling around the bottom of the fish bucket were originally what fishermen gave to their indentured servants to eat. People were so averse to eating it that they ground it up and used it as fertilizer, instead. Being seen as someone who had to eat lobster was something you generally didn't tell anyone until at least the third date.
British POWs during the Revolutionary War supposedly revolted over being fed too much lobster, after having apparently developed culinary Stockholm Syndrome from British food. Some states actually had laws against feeding lobster to inmates more then a few times a week, on the grounds of cruel and unusual punishment, as it was seen as the equivalent of eating rats.
Then How Did it Get So Fancy?
Somebody went and invented the railroad. Soon, rich people from the middle of the country--who were painfully unaware of what was cool--were tricked into buying the sea insects. But after tasting them, they realized that they must have discovered the long lost gatekeeper for butter.
Ironically, lobster is now a commonly requested food for prisoners receiving a last meal before execution, where as back in the day who knows how many last meal requests were something to the effect of, "Anything but more freakin' lobster, ya cruel bastards!"
The oyster is a cousin of the snail, nature's glue stick. Oysters also hang out with, and look like, rocks; further proof that giving in to peer pressure is an important survival technique.
Furthermore, in the olden days, eating one required you to be really committed to the task of eating something that looked like a rock. If you succeeded in prying them off of rocks without just giving up and eating a baby, you still had to get that sucker open, because they have to be eaten when they're as close to alive as possible. This involves cracking open a shell that is the animal kingdom's equivalent of a medieval chastity belt.
Eating one you've found to be already even a little bit open (and therefore dead) is pretty much booking a two-night stay at the nearest bathroom, where you'll have plenty of time to wonder why it was you thought that it'd be a good idea to eat a rock.
So you can see why the abundance of oysters in the 19th century led to their being mostly eaten by the working poor in the U.S. and the U.K. (also, they're not very nutritious). Dickens even mentions them derisively in The Pickwick Papers, making them certified riff-raff food even in a literary universe where people are willing to start shit over gruel.
Then How Did It Get So Fancy?
The industrial age brought a population boom and many, many oysters were eaten. Coupled with the kind of pollution you normally only see in dystopian 80s movies about 1999, many of the oysters were killed off, driving up price and demand, and therefore catching the interest of rich people.
To fix this problem, foreign oysters were brought in to replenish the population. Unfortunately, 19th century medical science was still in its Flintstone's car stage, and nobody thought to point out that the local and foreign oysters might carry diseases that the other might not be immune to, leading to tons of oysters eventually becoming rocks for real.
Thus oysters were made permanently scarce and pricey, and as Beanie Babies proved, rich people will spend money on anything if doing so means that you can't have it.