Start your stag do with satisfying your twisted humour and eyes of the stag group.
Imagine the reaction of your stag, when he gets arrested by the German cops in the middle of your bus transfer from the airport.
Then just check how his face will change as a hot female police officer will start to take her clothes off to a dynamic tune. This moment will be definitely something that will be carved into his mind for ages.
Just make sure he doesn’t know about this surprise for the maximum effect.