Sadly, this almost happened to me once.  I was a funeral for my husband's grandmother and all of a sudden the preacher started talking about aliens.  And he was really going off about how aliens couldn't possibly exist because the Bible doesn't mention them.  My husband was a pallbearer so he was sitting in the front several pews away from me, but he turned around and gave me the strangest look.  I had to stifle a laugh and pretend it was a sob.  Literally nobody else at the funeral even noticed the lengthy alien speech.  I guess they were grieving too much.  My husband asked some of them about it later and they all thought he was crazy, but I heard everything too and could confirm his story.