10.) When there's only one other person in the elevator, tap them on the shoulder and then pretend it wasn't you.
9.) Ask if you can push the button for other people. Push the wrong ones.
8.) Bring a camera and take pictures of everyone in the elevator.
7.) Move your desk into the elevator and whenever someone gets on, ask if they have an appointment.
6.) When the doors close, announce to the others, "It's okay! Don't panic, they open again!"
5.) Announce loudly, "Going up!" or "Going down!" whenever the elevator changes direction.
4.) Drop a pen and wait until someone reaches to pick it up for you, then scream, "That's mine!" (Stepping on their hand would be a nice touch.)
3.) Stand really close to someone, sniffing them occasionally.
2.) Leave a box in the corner, and when someone gets on ask them if they hear something ticking.
1.) Wear a puppet on your hand and use it to talk to the other passenger. (Or to pat their faces! Arghhh!)
-borrowed from Bren