https://marco.org/2007/11/06/what-happens-at-a-dentists-office-is-bad
What happens at a dentist’s office is bad conversation. Conversation when you are tilted back on a Star Trek death chair, have an alien autopsy light shining in your eyes, and your mouth is wide open being filled with goop and/or sharp instruments being wielded by a dentist who is asking you something like, “So, did you do anything fun for Halloween?” This may sound like an open-ended question, but chances are your response is going to be very similar to: “Aaaahhhhuuuaaaaahhnnnnnnoaaa.
— Seth Brown - Making conversation — thanks, Dan