When we ate at Smokey B restaurant, I left a cash tip on the table, I used a credit card for our food, I drew a line on the tip line and listed the total on the bottom for just our food and as I said I left the cash tip on the table. When I got home I looked at the credit card charges, a 20% tip was added to my charge. If I wanted a tip on my credit card, I would not have left cash on the table. In other words, don't use your credit cards anywhere there.