Mr. Smith lives on the 30th floor of his apartment building. Every day he takes the elevator down from his apartment to the lobby. After work, he takes the elevator from the lobby to the 15th floor and walks up the stairs the rest of the way. On rainy days he takes the elevator all the way from the lobby to the 30th floor. Why?

I know the answer to that one...... I honestly hate those kinds of riddles where the answer can't be derived from the riddle. Mr. Smith is a midget and can't reach the 30th floor button, but on rainy days he has his umbrella with him and uses that.......