I gotta couple..
Just plain mean: A few years ago I had a real pain-in-the-ass NCOIC who had himself a girlfriend "on the side". He didn't even hide it, and even told a few of us that he had the girl fooled into believing he was single. So one day while he was out of the office, his phone rang, I answerd and it was was his wife, she asked me to have him call home asap. As luck would have it, the girlfriend called right after I hung up and asked for his home phone number.... I was more than happy to oblige.
New guy initiation: Our whole Security Police Flight got involved in this one... the new guy was the perfect candidate. One of the weapons storage structures (earth covered) had allot of comm related antenna's/sat dishes etc on top of it and was cordoned off with radiation danger signs (due to the antenna, not the nukes inside). There were also these little 1' access boxes buried up there with the lid flush with the ground (which we stuck a red flashlight in). On the selected night at about 1am, we told new guy it was his turn to go up and do (a fictitious) radiation check. Had him put all his chem-gear/mask on and told him to go up, go into the cordon area, lift the lid and check for a red light. If he see's the red light, he's to immediately report by radio. So a little later the guy calls in the red light. THEN, all at about the same time, the Flight Sgt gets on the radio and says to him "Roger the red, stay calm son, an ambulance is on the way", the dude working the control building starts hammering the area klaxxon and we have a patrol with lights and siren's on come screaming down the flightline road towards the weapon storage. New guy comes running off the building in a panic to beat all panics and tries to get in the fire-team room (hardened structure) but we have it locked down tight. The guy rips his gas-mask off and is REALLY wailing "lemme in lemme in", I mean he's in tears now and we're STILL telling him it's too late, the area, and you have been contaminated hehe... best one we ever pulled off lol.