Quote Originally Posted by The Man
I liked that episode of Futurama.

http://en.wikipedia.org/wiki/Grandfather_paradox gave me more than I needed or even wanted to know about the grandfather paradox. Wikipedia's great like that.

edit: ok reading this stuff is giving me a headache. *head explodes*
I encourage people to read Barjavel's book, btw. It's good stuff.

I disagree with the "not touching the ground" paradox, because it supposes any movement is logarithmic when it's not the case. If I punch you, I can guarantee I'll touch you at some point and that you'll feel it. xD

Otherwise, most paradoxes that have been said are the ones I could think of. I'd add Shrödinger's, but it gets a bit technical (yay quantum physics).