A women lives alone on the 30th floor and hates taking the stairs. Every day she takes the elevator down to the lobby floor to go to work. When she comes homes from work, she takes the elevator to the 20th floor and walks the rest of the way up, except on days when it rains. Those days she takes the elevator all the way home.
Why does she walk the last ten flights of stairs if she hates it so much?
The woman is too petite to reach the button for the 30th floor. She can only reach the 20th floor button. On days when it rains, she uses the umbrella to hit the button for the 30th floor.