What is the BEST or worst prank you've ever successfully pulled off?

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Here's your chance to come clean or brag about your pranking skills. Over my 35 yrs. I have pulled some really cool pranks, and been the victim of some good ones as well. But the one prank that sticks out as the coolest by far was pulled my Freshman year in High School. A bunch of us (12 to be exact) got together a couple of hours before school started and we took every teachers desk in our High School and swapped it out with a different teachers desk, when classes started there were absolutely no desks in the same rooms they originally were, and the reactions and responses from teachers were awesome. We had a super cool principal and when he gathered our entire class together in the Auditorium to discuss it, he told us it was wrong, but it was the funniest, most original prank he had ever seen. Since there really was no harm or damage done. He let us all go (since he also couldn't figure out which 12 it was) with only a stern warning. The pranks continued throughout High School, and there was never any harm or damage done so it became sort of a running joke with us and our principal and as long as they stayed clean and harmless he just gave a lecture on proper behavior LOL:).