Quinn's Pants Challenge
This was a project for my At Home in the Universe class. Basically, the story goes that this physics professor embarrassed himself by pulling off his pants in front of a hall full of people, but redeemed himself by putting them back on again inside out without ever removing a rope that was tied to each ankle.
It's sort of simple, really. The challenge is this: Take 5 feet of rope. Tie each end to one of your ankles. Take off your pants, and put them back on inside out. I am not going to tell you how to do it, that's the challenge, but it's really not that hard. Anyway, try it! It's fun!
The only rule, really, is that you need to be decent under your pants. I recommend gym shorts or something. That's what I used, and what a bunch of other people in the class did.