One man who lives on the 12th floor every day takes the elevator to go to work. When he comes back in the evening, unless it is raining or there are other people in the elevator, he goes with it just to the 8th floor and then uses the stairs for the last 4 floors. Why does he do this?
The man is very short. Unless he has an umbrella or can ask other people to press the button for him, he can't make the elevator go to the 12th floor.