Riddle: A man lives on the 45th floor of an apartment building. On rainy days, he takes the elevator to and from his apartment, but on sunny days, he will take the elevator from his apartment to the lobby but walks up the 45 flights of stairs when he returns home. Why doesn't he just take the elevator all the time?
Answer: He's a midget. On rainy days, he can hit the 45th button with his umbrella and of course he can always hit the lobby button because its so low down, but on sunny days, he doesn't have any way of hitting the 45th button so he just takes the stairs.