Thanks for mentioning that, Kitty. I was thinking about posting a similar comment. It has been my experience that when a person says "I tip well" that means they don't know that they are bad tippers (I'm of course gneralizing here, don't send hate mail).. or they are what we call "lip tippers," all talk: "You were wonderful, what great service. I'm going to tell your manager what a great job you did." You know what I say to that, "Say it with money, honey!"
Usually instead of challenging a person on what they believe a good tip is, I just answer, "Oh, so you're a base twenty-percenter?" That usually gets the point across to people about what a "good" tip is.
Now we're off topic sorry. A little public service announcement never hurt anybody! Especially not our hard-working service people.