Friday dinner party conversation stopper

OK, I've got one. Parmenides at his most curmudgeonly is always good for shutting down conversation. They'll think you're talking about them; not Parmenides talking about pre-Socratic Greece.

...I bar you from the road the witless wander,
the splaybrained masses without self-direction,
deaf blind and astounded, the paranoid millions
who compulsively confuse what is with what isn't,
all of them moving on a retrograde road.