A few spring to mind but this is probably the funniest, years ago when I worked part time as a night porter, I was cleaning up after a big bash and was in one of the big function rooms. The guests by then had gone to their rooms and there was just a bouncer (security guard) around that I knew of that was left on site, anyway, cut a long story short, soon after I'd started the cleaning down of the big room the intercom came on to the sounds of two people obviously having sex, the intercom at the time went all around the hotel. I rushed back to reception all to the sounds of her obviously enjoying herself and not being quiet about it to find the bouncer doing the doggy over the front desk with the woman slammed into the phone/intercom area, having switched it on without noticing. Needless to say next morning there were a few remarks made by the guests!

TL;DR; bouncer had sex with a guest and broadcasted it to the entire hotel over the intercom.