Think you've had a cold winter? Well, okay, you're right, it has been a ridiculously chilly past several weeks. But just imagine if you were insane enough to strip down in these temperatures and voluntarily leap into a pool of ice-cold water. How would that feel?

You can ask one of these people, if you ever see one in person. Though, to be honest, we're not sure if approaching any of them is really the best idea. Anyone who would do something like this probably already had a screw or two loose, and after having been submerged in such conditions—even for a short period—really, how many remaining brain cells are we talking about here?