I know one, press all the buttons on the elevator because you're bored, then talk real annoyingly to two girls.
True story, happened to me and my friend. We were at a youth conference and staying at a college. Well, our rooms were all the way on the 16th floor. We were in the lobby to get on the elevator, get on it, there are these two girls on it who said they pressed all the buttons because they were bored. Then proceeded to be like "Omg how old are you?" "We're 17." "What! You're 17? No way, I don't believe it. You can't be." "Yeah...We both are" "No way. You're so short!" "Yeah we know..."
So we were trying to be nice and everything...Then they finally got off on their floor (like 9 or something) and as soon as the elevator stopped on the 10th one we switched to the other elevator. Yep...That was one interesting elevator ride...