Being at that age where penile exploration (and subsequent comparison) was particularly rife, three friends and myself thought it would be a cracking riot to share a communal piss in the "big kids" loos.
Giggling began as four streams joined togeteher in glorious Handelesque harmony, but it soon got too much to resist.
It started with a little flick, a little move to the side, then suddenly we were taken by the moment, spraying our urine on the toilet, walls, floors, and each other. We finished up, convulsing with laughter; the last boy making a show of it and spinning around in a 360 degree piss cycle.
We then opened the door to find our teacher standing there, fuming at our soaked trousers. Two boys started crying right there; I held strong though, until they broke me back in the office - the "getting your mum in" card was too damn effective.