My platoon was OPFOR for a Regimental LOGEX (LOGistics EXercise), and we were making heads explode.
Dummy TNT charges made from a chemlight, a piece of 550 chord, and a green painted block of wood does wonders to send some people off the rails... Especially when we would drop them around the fuel trucks.
We were told by the Regimental Commander the morning of the second day that we needed to be a little easier on them.
Deliciously evil.
Closest I came was writing “satchel charge” on a tuna mre and throwing it at the opfor.
They looked it over, read it, and then shouted “Tuna!” before scattering.
Yeah, I got yelled at.