A stag nights prank that is not offensive nor dangerous. Back at the hotel on the night of the stag do, you must put the groom into bed completely drunk wearing nothing but his boxers/briefs. So drunk in fact that nothing will wake him. When you are sure he won't wake up, take ALL his clothes, shoes, money, travel tickets, mobile phone etc etc. Leave him just a lovely floral dress (and if possible matching shoes) and a note saying that you'll meet him down a pre-selected pub in the morning. When the groom awakes, the rest of the stag party will be down the pub along with his clothes etc and he'll have no alternative but to put on the dress and shoes to retrieve all his gear. Another good idea is to take with you some bright nail vanish and paint his fingernails as well, as he'll have nothing with him to take it off.