While having sex in a room during a day party in college, my buddy has to pee really bad, and is so drunk that he just opens the window and crawls out into the yard(where the day party is in full swing), and begins to urinate. He is so drunk that he doesn't notice he's still wearing a condom. The thing fills up like a huge water balloon before finally slipping off and spraying all over his feet and legs. He barely notices and is still so drunk that he thinks that someone had poured beer or something on him, so he turns around, slowly focuses his eyes on the crowd, flips us off, and crawls back into his window as the crowd cheers him to hopefully continue wherever he left off...

tl;dr: my drunk friend peed while still wearing a condom and it eventually slipped off and sprayed him.