Little Mary lives on the 30th floor of an apartment. When she leaves for school she hits the button for the main floor. She gets on her bus their. When she gets to her apartment after school, she goes to the elevator and gets off half way up the building.She walks up the stairs the rest of the way.
Why doesn't she stay on the elevator till the 30th floor?
Answer: LITTLE Mary is too short to reach the 30th button.