The only time there was any danger was when a Campus Policeman took the elevator up to the top floor and stopped the elevator -- my friends were stuck facing a brick wall (if the elevator is stopped at floor N and you are on top you can get out at floor N+1 if there is a floor N+1). What the CP didn't realize is that there were also people surfing the adjacent elevator, who came up and rescued the miscreants he thought he had trapped. Of course, they had to leave the elevator with the CP in it stuck on the top floor (the "stop" button on the roof of the car overrides the "stop" button inside the car, and had to be set so that there was no danger of the cop making the elevator go down while people were crossing over to the next one).