From my own personal Gyrogearloosean sense of self. Never tip more than 20%, at least if you frequent the establishment often, as you don’t want people to think you’re an insecure chump. Kind of like buying a women too expensive a present to remind her you’re not really that much fun to be with. Just be your waiters favorite customer. Tipping 10/15% for bad service only leaves the message that you’re cheap or short of cash – you only do it because you are crazy. For bad service you leave a penny or a penny placed on top of a one-dollar bill. If the initial service is slow you simply get up and walk out.

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89 300E
79 240D
72 Westy
63 Bug sunroof
85 Jeep CJ7
86 Chevy 6.2l diesel PU

"The object of life is not to be on the side of the majority, but to escape finding oneself in the ranks of the insane."
Marcus Aurelius