Ooh, another family one (DEFINITELY NOT ME).
My brother once went clubbing in Swindon. Upon departing the club in the early hours he realised that he really needed a poo. In his mind the sensible thing to do was head into the alleyway alongside the club, and curl one out.
Unfortunately - and I still can’t comprehend this - he fell asleep mid act. He awoke at dawn, trousers around his ankles, lying next to his own turd.
I told this story as part of my best man’s speech when he got married. It went down a treat.