Never mind testing the kid. The teacher should be sent to the mental hospital and tested for sanity.
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.
I heard a story in college about a guy who worked in the cafeteria.
He had an ongoing feud with a former friend.
So the "hero" of this story stole an industrial size container of lime jello from teh cafeteria, and used a blow-dryer to force the powder under his rival's door.
THEN he ran a hose from the communal bathroom down the hall, and ran galons of water under teh door to the room.
Apaprently it took hours to clean up the resulting green slime.
I don't know if the guy got expelled or not.