Back in the early 80s, I was a Naval Aircrewman, flying in P-3 Orions.
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To become aircrew, you had to pass a pretty tough check ride flight. It was always tradition to screw with the aircrew candidates on this flight. There was this officer who'd love to help out. He was a very short and thin guy, and could squeeze into small compartments on the aircraft. While the aircrew candidate wasn't looking, the other guys would stuff the officer into an impossibly small locker. Then, as the instructor was quizzing the candidate, he'd inquire about a circuit breaker that did not really exist. "It's not documented, but you need to know where it is. You have to open this door, and stick your arm way up inside to feel it. Go ahead."
Of course, the candidate would do exactly as he was told, and the officer inside would forcibly grab and yank on the kid's arm as hard as possible.
Even though our flightsuits were dark green, and the inside of the aircraft was poorly lit, it was easy to watch a dark patch of Nomex fabric appear, indicating involuntary urination