We were warned in my high school that any harmful or detrimental prank risked you not walking at graduation. Of course, they still happened anyway, and if they were caught they were true to their word. Grant it, the pranks that happened at my school were a little more severe than gluing a few trays together (one was letting a BUNCH of crickets loose in the basement, another was climbing onto the roof of commons and drawing graphic body parts on the windows, which was actually pretty funny afterwards because when admin cleaned the windows, they only cleaned the spots where the paint was, so you could still see what they had drawn even after they washed it off because it was a clean spot lol). An example of a harmless prank though was setting up huge signs in the parking lot that says "USED CARS FOR SALE: ALL CARS ONLY $2003!" and putting up streamers and people actually thought it was a used car lot.... lol. That one was a prank that was considered "ok".

HJ did not get to graduate period. But it had nothing to do with a senior prank or his grades. He had previously been homeschooled until his junior year when he was enrolled in public school. His mother gave all the appropriate paperwork and they said they (his sister and him) were good to go. A month before graduation they suddenly say "oh well we need this, this, this and this" and his mother had TOLD them half the papers had been lost in a fire, and they said it was ok what she gave them already would be fine. So neither him nor his sister got to graduate. They both had to get their GEDs.