Pet peeve: restaurant (fast food/deli) saying online and over the phone that they're open till 11, with no mention of the kitchen closing earlier. You get there before 11 and they tell you to pound sand.
Bigger pet peeve: when they tell you that hey the kitchen closed at 10:45, sorry not sorry. I pointed out that ummmmm, it's 10:40. A lot of good it did me.