I once did the Holloway Road pub crawl in London with a friend. At the final boozer, the end of level boss of the crawl, there was karaoke going in the back room so we put our names down and 10 minutes later we were up on stage singing Queen's Don't Stop Me Now incredibly badly. Mid-song, I noticed a massive pile of wedding presents under a table near the stage and realised we were at a stranger's wedding reception. The only thing we could do was to style it out and finish the song.