What's the best joke you played on someone?

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When I was a kid, I used to love playing jokes on my brother, from short sheeting his bed to putting green dye in his shampoo. At work one time, my workmate and I attached rubber bands to the back of all the desk draws, so that when they were opened, they would slam shut before you put your hand in it or we taped the receiver down on landlines so they kept ringing when they were answered. What is the funniest practical joke you have played on anyone? Have you ever got in an elevator and faced the back wall or the other people who are in the elevator to see how long it takes them to turn around?