Hmm. Well, no really dramatic ones, Henry. I've had the unfortunate experience of ordering what turned out to be extremely mediocre food, badly cooked, way overcooked, or undercooked at:

1 Chinese restaurant in Penetanguishene - I never went back there.

1 Highway restaurant north of Orillia - Never went back there either.

1 place called the "Hasty Tasty" (Ha! Ha! Ha!)(one would be in haste to leave after tasting their food) Never went back.

And...hmmm...well, the worst cup of coffee I ever had was at Black Cat Fish and Chips in Toronto in the early 70's. Never went back. And they are STILL there, still in business to this day! Their survival seems to defy the very principles on which capitalism is based. It reminded me of the greasy diner where Dagwood eats in the comic "Blondie".