I was once with a group of customers in a fancy restaurant in Brunswick NJ. The food was good but the waiter didn't smile once and clattered the dishes on and off the table. When it came time to pay I accidentally gave him the one of my two credit cards that was maxed out. He came storming back to the table demanding to know why I was trying to pay with this "useless piece of ****" before frisbeeing it back at me. I handed over the other card and when the check came back to be signed I put a big thick line through the tip part. He followed me down the street demanding I give him a tip shouting "It's f*****g a*****s like you that are the reason I can't feed my kids". Up until then I had been trying to keep my cool in front of the customers, but I couldn't stop myself from turning round and saying, "No, it's s****y service like that that is the reason you can't feed your kids."