15-20% = Excellent server (friendly + solid food)
10% = Average (Typically how much I give)
My garbage (penny,dimes,nickels) change I get back from a bill = Garbage service/food (Food + server sucked)
Proabably only had 2-3 times, where I left like 1% tip or nothing...
I use a tip app on my iphone
it lets you rate the service + food and gives you a nice little percentage haha