Soggy biscuit, the Daisychain Club, and the Milk and Biscuits Society. All fine traditions of boarding school life, apparently.

As a comprehensive school student, we didn't have so many opportunities to play games like that, but I do remember going on stuff like cadet camp. There, we would spray a sleeping boy's flame-retardant over-sheet with aerosol deodorant, and then set a lighter to it and tap the boy's shoulder before running in to bed. I think the idea was to encourage sleep deprivation so that the weak would drop out. That, and getting gaffer tape and suspending the scrawnier boys to the underside of their bunkbed whilst they were still in their sleeping bag.

Then there's all the standard fare of dipping a sleeper's hand in to a cup of lukewarm water to make them wet the bed, or covering their sheets with flour and water so that they were rock solid when they came back at night.

Actually, the only stuff I remember that was strictly frowned upon by the officers was shaving off a single eyebrow so they'd have to either shave off the other one, or look like a tit. Anything that would make a cadet look different on parade or make their parents ask questions was out, though I stuck a fork in a renowned bully's cheek when they tried to shave me on the last day of camp, and they stopped doing that to anybody at that point.

I can see the Marauders being the type to play those sort of games, actually, but not the current generation.