It didn't mortify me, but I think I mortified my neighbor when I hinted that I heard her having sex from my room (she lives across the hall from me). She completely denied it, so I sensed that she was all embarrassed so I told her it must have been the girl to the left of her instead, and she played along saying it must have been, and how her neighbor is all loud and stuff... it was so hard to keep from telling her that I knew it was actually her because the guy she had sex with told me that they had sex earlier on that day, haha.