I've solved all of my childhood mystery movie memories — save one — and it's perplexed me for years! Here is what I can recall:
The scene takes place in a bar/restaurant. Some people are sitting around a table, and there may be some sort of aquariums (?) in the background. A man or men walk up to their table and it's a little tense. What really scared me, though, is what was on the table. There was some sort of centerpiece that frightened my young eyes. I'm not sure it was meant to be scary, but it was to me and has remained the centerpiece of this movie mystery memory for over 45 years. I'm not sure if it was a movie or TV show, but I know I saw it on TV, not in a theater.
I would've see this sometime between 1969 and 1971, when I was 4-6 years old. Thank you for any help you can give me! It's been a looong, frustrating trip trying to solve this one.
P.S. There is an early 70's anthology that has vampires in a restaurant, but that's not it.