When do you know the table just sat in your section is going to be trouble? At first glance? When they talk and reveal their accents or manner of speaking? When they ask if the refills are free?
I've mentioned the high amounts of truckers we get at my establishment. We roll our eyes when we see the truck pull in, but it's kind of a 50/50 on how terrible it's going to be. At best, we get a shitty tip, but we're used to it. At worst, they are rude, condescending, entitled, inappropriate, etc.
I had two yesterday. I should have known when one, looking at the page that says DINNER SPECIALS, pointed to an item and asked if it was a special. Uhhh... yeah?
Anyway, the rest of the meal was uneventful. I checked back at least twice, refilled drinks, they said everything was finefinefine. Then they go to pay and complain. "That was the worst meal I ever had. The coating on my fried shrimp was too thick and tough." "Well, why didn't you say anything to Blondie?" "Well, we figured we'd just suck it up, but I thought I'd let you know."
Then left me A DOLLAR. Because obviously it's my fault that you didn't like your food, and it's also my fault that you didn't say anything when I checked on you.
One of these days my eyes are going to roll right out of my head, I swear.