I usually tip average amount.. but I find it interesting that a tip amount is expected. If the service is horrible then why give them more?? I may have never left a tip before.. but I'm sure the waitress was horrible... I went to breakfast with a friend.. and I tried to get the waitresses attention numerous times. She pretty much ignored us, never once asked how are you doing.... and she made us wait for a good 10 min. after we were done. I think we left like... 95 cents on a 14$ and something cent bill. If the service is amazing then I would gladly pay a bigger tip.. even just a little effort=better tip.. it should be earned, not expected...