The best one I've ever pulled off was powdered milk in a guy's bedsheets, after he'd been a genuine arsehole to a friend of ours. He reeked of sour milk for about a week!
At the Physics labs, there's a popular game that involves charging up a nice big capacitor, and throwing it to the next person through the door...if they're dumb enough to catch it, they get quite a buzz!
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Strewth
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