The year was 1981...At our school we had a 25 metre swimming pool. An end-of-year prank organised by some enterprising final year students was as follows. The group of ten, who were all boarders, bought hundreds of packets of powdered red jelly-crystals (aka Jello in the US)and surreptitiously emptied the contents into the pool at night. The next day the whole school could see that the poll had been transformed into one giant red blob. The Criminal Congealers were caught red handed, when a few empty containers of the stuff was found under the bed of one of the criminal masterminds.
So because of Jello, they were banned from the school
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Whoa there! Surely it would have taken several 55-gal drums of the crystals to transform an entire pool into jello. I'm taking your story with a 2 1/2 lb bag of salt, thank you very much.