Out of sheer curiosity...and after receiving a $.32 tip on a $48 bill tonight, I was just curious as to how much you are inclined to tip a server that gives you decent/good/excellent service. 5%, 10%, 15%, 20%, 20+? How do you decide what to give? Is it based on past serving experience (if you've had any)? Or is it based on how tight your own money is? etc.