I can do you one better. My gf of a year broke up with me, so I had friends over to console me. We were all chilling in my bed (2 guys, 2 girls). One girl had to leave, so I walked her to her car. I return to find my other two having sex IN MY BED. I stood in the corner for five minutes before walking over and saying "hey, I just came to grab my phone." then walked out.