My wife and I have an ongoing tiff about how much to tip the wait person at a restaurant. I am much more strict, and tip for service. I tend to calculate a strict percentage. My wife insists on a couple of bucks, even if the bill is very low, sometimes resulting in a very high percentage. IRS assumes that waiters are receiving 15% on average, so there is a tacit expectation that 15% is standard. Personally, I tip 15% for good service, but my wife is appalled if I leave less. TIP stands for "To Insure Promptness," so if the service is not prompt or courteous, the TIP suffers accordingly. For really excellent service, sometimes I go as high as 30%, with 20% being a "good tip" in my mind. What do you all do about TIPs? Am I being silly? Am I a hopeless tightwad?