First, there's British philosopher Nick Bostrom, who came up with a statistical argument that we're living in an extremely sophisticated version of The Sims. The idea is that we have the ability and the inclination to build our own simulated realities, as evidenced by the growing video game industry. Thus it's inevitable that we'll build our own Matrix one day, when our level of technology allows it. That simulation will continue to grow in realism and complexity until one day it will have its own civilization, who will want to build a simulation of their own, and onward to infinity.

Electronic Arts
How much pixelation do you have over your junk? If your answer is any at all, you're probably living in The Sims.

If that's true, then there might be a virtually infinite number of simulations out there, so the chances that we're one of them are actually much higher than the chances that we're not.

Then there's physicist Silas Beane from the University of Bonn in Germany. His theory is that, if we are actually living in a computer simulation, then our universe should have a "resolution" -- in other words, there should be a limit to how small something can be, just like nothing can be smaller than the pixels on your computer screen.

Okea/Photos.com
Now, is the universe in VGA or super VGA?

And, incidentally, they have found such a limit. It's something called the Greisen-Zatsepin--Kuzmin or GZK limit. It's about as technical as you'd expect for something with that many hyphens and consonants, but Beane thinks it might be the first evidence that the world around us is made up of artificial bits created by some other intelligence. Of course, this evidence might not be that compelling by itself, but Beane and his colleagues are busy thinking up new ways to detect the computer we might be living in, presumably by mapping the universe in search of the Blue Screen of Death.

Roadrunnerdeluxe/Photos.com
Congratulations -- proof we're all living inside a computer! Also, everyone's now dead.

As with all of the fringe theories on this list, there are those who scoff at such a notion. And they will continue to, right up to the point that a team of superpowered Matrix Agents storm their office.

Almost every sci-fi franchise has done the "evil alternate-universe version of the main character" storyline at least once. They just can't resist a scene where the hero fights a dark, bearded version of himself. Well, if certain experts are right, your doppelganger is out there, somewhere.

Peter Hart/Photos.com
Unfortunately it doesn't only work for hot people.

The theory goes that there are only a certain number of combinations of particles possible. Give a room full of kids a set of five LEGO blocks and a few of them are going to wind up building the same thing -- there are only so many ways they can fit together. Well, everything in our world -- including the people in it -- is just LEGO structures made of tiny particles. There's only so many possible combinations, and in a large enough universe, all those bits are inevitably going to wind up in the same place again and create another you.

It's not likely that you'll ever cross paths, though. Science's prediction is that your doppelganger lives about 10 to the 10²⁸ meters away (or farther than you could travel by bus).

Stephen Page/Photos.com
And even if you could, you'd probably have to sit beside this guy the whole way.

Nevertheless, the bigger the universe is, the more likely it is that there's another you walking around out there. Scientists don't actually know how big the universe is, by the way, but if it happens to be infinite -- which some think it is -- then the fact that you have a cosmic twin is downright certain. On an infinite scale, every pattern has to repeat eventually. The only possible question is, if you ever did run into your cosmic twin, would you fight or f**k?

What's more is that we're not the only brane out there. There should be other branes floating around in the cosmic nothing that lies outside of our own universe. These would all be parallel universes. It's kind of a Doctor Who fan's wet dream. The terrifying thing is that there aren't any cosmic traffic cops out there, so there's nothing stopping one universe from smacking into another one.

What would that look like? University of California physicist Anthony Aguirre thinks it would be like a giant mirror coming down at us from the heavens so that the last thing we see is our own horrified expressions as we immediately understand the fact of our impending obliteration. Although he didn't quite put it like that.

Christopher Noble/Photos.com
"No! No! I don't want to die staring at my own stupid hipster beard!"

If this was even possible, then it should have happened before, right? Well, physicists are rarely in the business of putting us at ease. Tufts University physicist Alex Vilenkin and his colleagues think they may have found the scars of a collision between our universe and another one at some point in our history. The "cosmic microwave background" is a faint radioactive signal that permeates the entire universe, and all of science's calculations insist that it should be pretty uniform across the universe. But it isn't -- there are hot and cold spots in some places. Vilenkin and Co. think that this disruption might be evidence that other universes have been smacking into ours.

Again, other people think they're crazy, we're just passing it along.

That's the theory put forward by Oxford professor of quantum information theory Vlatko Vedral. He argues that the most fundamental component of the universe is not a unit of matter, but a "bit," which is the same kind of bit that your computer uses (that is, the tiniest amount of information that can be conveyed). Fundamentally, one bit is just a yes-or-no answer to a question, and your computer uses tiny magnetic switches to make its calculations. But Vedral wants us to imagine subatomic particles as being the same mechanism -- trillions and trillions of yes-no answers swirling through the void.

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Is this theory a bit far-fetched? Yes! Will we ever know if it's true or not? No!

After all, every time a particle comes into contact with another particle, the two of them exchange bits of information. It can be as simple as a particle transmitting its direction of travel to another particle by smashing into it.

MIT professor Seth Lloyd agrees, and he knows something about it because he's the inventor of the first working quantum computer. That's a computer that uses tiny particles like atoms and electrons to work, instead of comparatively hulking great chunks of electronics like microchips. And that's basically what we're talking about here on a grander scale, leading Lloyd to literally state that the universe is a quantum computer.

Ng Choon Boon/Photos.com
It probably goes without saying, but nobody Ctrl-Alt-Delete the quantum universe computer. Thanks.

But if it's a computer, then what is it computing? Lloyd's answer is that it's computing "its own dynamical evolution," but we prefer to believe that reality up to this point is just the loading screen for the most kickass MMORPG of all time.

According to Dr. Nikodem Poplawski from Indiana University, all of the matter that gets sucked into a black hole might wind up turning into a new universe on the other end. After all, when you ask scientists what happens to the stuff a black hole swallows up, most will shrug their shoulders and admit that it's one of the great mysteries of the universe. Poplawski's calculations suggest that the matter flowing in one end as the black hole chews its way through the galaxy might be the equivalent of a new Big Bang in some other reality, which would effectively make a black hole a doorway to another universe.

NASA/Wikimedia Commons
A doorway that will tear you apart atom by atom, mind you.

Calculations show that the theoretical other end of a black hole, a "white hole," is a time-reversed version of the black hole. We did the math ourselves just to make sure. In other words, the black hole draws matter in and compresses it, while a white hole spews it forth. This compression and expansion of matter is mathematically equivalent to the creation of a universe.

The implication is that each black hole in our universe may contain its own universe inside it. Consequently, our own universe should itself be inside a black hole, which in turn would be inside its own universe as well. It's like a never-ending series of Russian nesting dolls. Or this:

If this is true, then it would explain why distant galaxies appear to be accelerating -- quite simply, their light takes a long time to reach us, so we're seeing them at a point in history when time was literally moving faster than it is today. It's also kind of really terrifying, because it implies that time is going to keep slowing down, until it ultimately stops and freezes us in place for eternity.

If the theory is correct, then at some point in the future, we'll all appear to move in slow motion to an outside observer. This will admittedly make everything we do seem more badass, since walking down the street will look like the opening sequence to Reservoir Dogs, and we'll all be dodging bullets like Neo. But that's not going to help our dignity since, statistically, at the moment time freezes once and for all, at least some of us will be masturbating.

George Doyle/Photos.com
Hey, if you have to do one thing for the rest of eternity ...

For more crazy things said by smart people, check out 7 Theories About Time That Would Make Doc Brown's Head Explode and 5 Mind-Blowing Scientific Answers to Life's 'Big Questions'.

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Related Reading: If you're full up with smart guy talk, these insane theories by U.S. politicians should get you back to baseline.