This is the stag's worst nightmare: arrested in a tough, ex-Communist country by police.
Imaginet the look on his face when he's accuse of a crime and nabbed by the local coppers and taken from the street or bar. Practice your acting skills as the stag is handcuffed, blindfolded and driven off by 2 large men who look like police. Now what?
Simple. Move to the strip club and await his arrival where he will be chained to the pole and the real show begins.
This works best if the whole group - minus the stag, obviously - is aware what is happening.
Why not combine this with an awesome Pissup Bar Guide? Your stag will need to get on the beers after his untimely "arrest"!