Originally posted by: nanobreath
Heres one:
A man lives on the top floor of a 50 story building. When he leaves he takes the elevator to the first floor and leaves. When he returns, however, he takes the elevator up to the 10th floor, but has to use the stairs for the remainder of the trip. The elevator is in perfect functioning condition when he takes the stairs. He doesn't take the stairs because he wants to, but because he has no choice. Plenty of other people take the elevator up further, and nobody is forcing him to use the stairs. Nevertheless, he has no choice in the matter and must take the stairs past the 10th floor if he rides alone. Why?
I've heard of this one too. Kind of a lateral thinking puzzle. The hardest riddle in this thread.