Idiots

Why do people feel the need to press the "up" or "down" elevator button more than once? If someone is waiting for the elevator, and has already pressed the button (ie- it's lit up), why press it again? It doesn't come any faster. It's not like there is a little operator in the shaft being like, "Oh crap! I forgot it was pressed once already. Better get to floor 3!" UGH.