We did that in the enclosed courtyard with a string of fire crackers!
Two older guys (ended up expelled for other things) played the best one. Was while I was at the school, but I didn’t see it. Before class and before the teacher came in the one kid was hanging out the window with the other kid’s cowboy boots in his hands. Just the boots were visible, and he was “struggling” with them.
The other kid was down in the courtyard and yelling “don’t let me go”, etc. As soon as the teacher came in, the kid in the class held on until the teacher got a look, then in a hurry dropped the boots and slammed the window shut like nothing was going on.
Of course the teacher rushed to the window, only to see the other kid sprawled out on the lawn three stories below.
I seem to recall something about the teacher having a sort of heart-attack, but that may be an excaggeration of the story.
A guy in my class on the last day of school drove his motor-cross bike up and down the stairs, halls, etc. He had to take summer school.
In college the wiz-kid student (but also a radical in many ways) got a few buddies and broke into the main building with the gold dome on top. They put black paper all over the gold dome (smart enough not to paint it!), and then big black cardboard ears.
He then reprogrammed the computer that ran the clock-tower chimes. It would play various tunes at various times of the day.
At the first early morning chime, it started playing the Mickey Mouse Theme Song! He got caught, and had to take summer school.
My graduation year NO PRANKS were tolerated. The year before, the graduating class had broken into one of the buildings, turned on all of the fire houses, faucets, etc. and clogged the drains. Then barricaded and chained the doors so the firemen, etc. couldn’t get in. Caused millions of dollars of damage. Idiots.
There is a differnce between a prank and damage.
The worst we did was back in junior high school when we got back at our math teacher, who was a mean, tough-as-nails taskmaster that no one liked.
Before she came into class one day, we took a firecracker with a string on each end that exploded when you pulled it apart and tied one end to her chair leg and one to her desk leg. She came in about ten minutes later, and when she pulled her chair out, that thing exploded and I swear she levitated about a foot off the floor.
None of us involved would talk for fear of death, so she kept the entire class after school for one hour as punishment.