When we were on a field trip, we slept in little houses. Me and my friends knocked on the door of the girls we dislike and were nice to them. While my friends distracted them, I needed to use the restroom and went to their toilets. Then I took their toothpaste and smeared it on the toilet seat. Later we heard that the toothpaste had stuck to their butts and burned so much! Best prank I ever pulled ! ....And they never found out who it was.