A teacher was a victim of the “stapler in the Jell-O” prank. He figured out that it was the janitor, but thought it would be funnier to blame one of the kids. So he set up a video recorder before class and pinned it on a student . . . and even made the kid remove the stapler from the Jell-O.
Here’s the scene in “The Office” where Dwight finds his stapler in Jell-O.