Third Grade prank:
The school administrators went on a tear dictating what the students had to eat and the students had to eat everything the students were given to eat whether they wanted that much or not. In response, a plan was made to see the teachers live up to their own rules after a series of pranks confronted them with some unlikey things to eat. One of the more innocent gambits went like this:
The school lunch tables had blocks of USDA butter/margarine put out on a plate. We took one of them and hollowed out the inside of the block, filled it with the USDA molasses, and sealed it up again with the butter/margarine that had been carved out. Then we slipped it onto the teachers’ lunch table and waited for the fun to begin. When the trap was sprung, the students asked the teachers what they were eating?
That sounds like a good one,
I like the one where the high school kids release 2 young pigs, labeled #2 & #3 into the hallways.