I liked having this thread around, but it was locked for post limit, so I'll throw up a second one.

http://www.gamesas.com/topic/1506580-dumbest-thing-youve-done-or-seen-today/

This one is more... sad and depressing than dumb, but I was doing some Quake Live last night while my roommate and his friend practiced their music. My roommate's friend is all "Oh, sweet, what game is that?" so I told him, "Quake." He never heard of it. He said it looked like Call of Duty.

Kids these days.

I like the idea of this post. I don't have any good stories right now, but I just discovered a http://www.reddit.com/r/whatcouldgowrong yesterday. It's filled with people doing really dumb things... So funny.