The meanest prank I ever pulled was putting tear gas grains in my roomies cigerettes.
The last place I was stationed in the Army, was a ammo supply point in Wildflecken, Germany.
One of the guys (Stilwell) I worked with at the inspection point was complaining about my roomie (Lundhagen), he was always bumming cigerettes, seemed like he never bought any. First we thought of loading a few with matchheads, and when Lundhagen asked for one Stilwell would flip out his pack with the loaded one foremost.
But then we thought of a even better idea. We, being a ASP inspection point had access to a lot of grade 3 munitions, etc., and the records were not the best. We got some granular tear gas, the kind used in training, put it on a heater, in a tent. Everybody who's went thru basic training went thru the gas tent , learned how to adjust your gas mask, etc. I know no one could forget all the fun you had in the gas tent.
To get back to the story, but took about 1/4 of the tobacco out of the middle, replaced it with the tear gas grains, did this to 2 cigerettes. Put them in the front of a fresh pack. Lundhagen had a car, and we rode back from lunch with him, he asked for a cigette, Stilwell, flips out the pack, Lundhagen takes two. But only one is the special.
We've never done this before, we have no idea what's going to happen, and he's driving. He lights up, but it's not a loaded one.
We get to the work area, I hang around as long as I can, but after a few minutes, I have to go to the inspection point, about 1/4 mile away.
He lights up the loaded cigerette, a few minutes after I leave. Takes one breath, instant results, runs to a nearby window, and coughs till he vomits. He was feeling the after effects for days, Me and Stilwell felt pretty bad about it. We didn't try to hide who was responsible. No official punishment came our way.
But Lundhagen got us both back, but we were playing so many tricks on each other, I don't remember what he did. Whatever it was, we deserved it.