A feeble attempt
To pry elevator doors.
Press "DOOR OPEN," dunce!
Whenever I'm the first one in the elevator, I press and hold the "DOOR OPEN" button. That way, when someone inevitably turns the corner and quickens their pace upon sight of an open elevator--the universal indicator of their desire to board said elevator--I don't have to risk personal injury from thrusting a free limb into the closing jaws. Then, once everyone has safely boarded or there's no more room, I press "DOOR CLOSE."
I think some people just press the "CLOSE" button whenever they see anyone else coming, just out of spite.