I don't know if is corect or not..

 But here is one in the mean while..

Everyday a man who lives on the tenth floor, takes the elevator down in the morning to leave his apartment building. On the way home he takes the elevator up to the seventh floor, gets off, and walks three flights up to his apartment. He does this everyday even though he hates walking the three flights up. When it rains, he takes his umbrella and can take the elevator all the way to tenth floor. WHY?