answer:Here is what I did last Saturday in a similar situation: At a sushi bar before a movie, we ordered in plenty of time, received our miso soup and edamame promptly, and it wasn’t too long before the tempura shrimp roll came. But after waiting half an hour for the Sushi Combo plate, we realized we would be late for the movie, and no one had been by for twenty minutes to even check on us. So I walked over to the cashier and asked for our check. And then the combo plate appeared, but it was too late. So I tipped 10% on the final amount, instead of my usual 20% which would have been on a much higher tab. But the cashier and the wait staff knew it was because they had been so slow. Writing “LOL” on the tip line is asinine and insulting. A comment on how slow the restaurant is would be okay by me, but they should have tipped her five or ten dollars.