I first seen this done at Youth Camp. The Leaders asked for about 4 or 5 volunteers. The volunteers are led outside, or somewhere where they cannot hear what is going on in the other room. The volunteers are then told that when they go back to join the group, there will be a chair for them to sit on, where they will have to pretend to be getting on a roller coaster ride, riding it, and exiting the ride. Meanwhile, the other youths will be told something totally different. They will be told that the person who will be sitting on the chair is really acting out how he/she acts when they are in the bathroom. It is very hilarious! Kind of weird, but funny!!