According to my friend, this happened in his physics class.
The teacher is an older, pudgy indian guy but he's generally pretty nice and lenient. One day, when no one's doing any of the work that they should, some students are bullstuffting around, and another kid is building a fort out of all the physics books. So the teacher takes a pad and pen and walks up to the fort, just out of sight of the kid inside of it. He writes something on it and then rips it off, getting the attention of the kid in the book fort. Immediately after, he pasted what happened to be a bright pink detention slip on the side of his fort. Then he went around the class like a traffic cop assigning lunch detentions to anyone else that was loving around and/or not working.
After he's just about done, one kid says, "Dude, you shouldn't have done that." T: "Done what?" S: "Given all of them detentions, it's forgeted up." T: "Oh really?" *rips another slip off his pad, pastes it onto the kid's desk*
