your priest/Rabi/reverend/bishop walk in on you doing something you shouldn't while they're doing something they shouldn't (sexual or otherwise). that tense situation increases until something weird breaks the ice like a streaker shows up or a mime..
akweird situation 2
a relative has a "thing" for you and your significant other finds that hot. no one said it wasn't going to be gross
akweird situation 3.
your parent drags you to the shrink to talk about sex dreams they've been having involving you and a family orgy