A girl lives on the 26th floor of a building. She takes the elevator down to the lobby and goes to school each day. When school is over she goes to the 20th floor on the elevator and walks up 6 flights of stairs to her room. But if she is riding with somebody else on the elevator she goes all the way to the 26th floor. Why does she do so?
She is a little girl and can only reach the buttons for floors 20 and bellow. She can't reach the 26th button so she has to walk up 6 flights of stairs, unless someone else is there.