In my AirForce daze, we used to pop the poor chap into a transport crate, pop them onto the nearest Herc aircraft and tell them it was bound for Antartica or something and then just do a little tour over Wales and back.
These were the safe ones, the more interesting ones included being tied to a chair, spray painted and then feathered, then popped into the village phone box and wrapping a couple of miles of cling film around it.
There were various dodgy ones that I will not discuss on such a family site, but am sure you get the idea.
A stag night is a right if passage, it only happens once, you should have a good best man who should be looking after you rather making your night a living hell. Just go out and enjoy youself........