Many years ago, I was a student in a junior college carpentry course.
Most of the students, including myself, were local to the area. However, we had two guys from elsewhere in the state who were roommates in the dormitory.
In short, these guys were total jerks! They made life tough for everyone in the class and resorted to whatever form of bullying they could when it suited them.
One of their ‘hobbies’ was stealing other students’ tools. I lost a few to them.
These guys got to be just enough of a problem it was time that somebody had to do something. The instructor had his reasons for not wanting to take a stand on it. So I did.
I worked over my ‘contacts’ to see if anyone could come up with some very objectionable printed material that could be ‘planted’. Everyone thought my idea was good, but nobody really had anything that would work reliably. Finally, I got a phone call. Someone had just moved into a place and found some gay porn stashed somewhere in there. I came over, picked out a couple of ‘winning’ pictures to cut out, and took them while the new tenant disposed of the rest of it.
Classroom session was after lunch. The chapter and page in the carpentry textbook to be discussed had been announced and was written on the chalkboard. Everyone left their belongings on the tables of the classroom throughout the day.
Over the lunch hour, I walked in, verified the place was deserted, and then planted some of the ‘choice material’ in the textbook of the guy who was the most aggressive a-hole of the two.
After lunch, the classroom filled. I was toward the front with a couple of the other guys who were older, more level-headed, and reasonable. The guys just out of high school clustered at the back. These two guys always moved into a position where they could essentially dominate the people in the back of the room, who did generally try to keep their distance.
The instructor told everyone to open their books to the page number listed on the chalkboard. We all did that…
Within a couple of moments, with much commotion, everyone from the back of the room was quickly settling in the front of the room.
The two guys from elsewhere were just sitting there looking at each other in total disbelief, and then they started blaming each other for it!
I recall them both becoming rather quiet and reserved after that. I think they did a lot of growing up that day.