A man lives on the 10th floor of a building. Every morning he takes the elevator down to the ground floor to go to work. When he returns in the evening, he takes the elevator to the 7th floor and walks up the stairs to his apartment on the 10th floor. However, on rainy days, he takes the elevator all the way to the 10th floor. Why?
Answer
The man is a dwarf/short person who can't reach the 10th floor button, but on rainy days he has an umbrella to press it