I did have an experience with the "automatic 18% for parties of 6 or more ". It didn't effect me personally, because I got my food. My wife's family met at cheddars for Christmas dinner, and the waitress was awful. She didn't write anything down, said she didn't have to. Out if about 12, only 2 if us got our food right, and 2-3 never got their food at all, even after going and talking to someone. After she brought what plates she did, we never saw her again, no refills, nothing. Someone else brought our bills, and the ones who didn't even get their food was charged full price, plus tip. They finally got a manager, and he took the tip off our bill, and their order they didn't get. I didn't feel bad about not tipping for that one. Me and Tiffany had a bad experience years ago, girl even cussed when I asked for a refill, got both orders wrong also. She lost her tip for the cussing, she didn't directly cuss me, but it was directed that way.