15% is normal for me.
If they don't write it down and get it right It just went over 20%... Mostly because someone that good at being a waiter likely didn't miss a beat on anything else.
I went someplace the other day where they filled in the tip for me on credit card recipt. They were going to get more, but they hosed themselves.
I feel somewhat conflicted about takeout.. A lot of places have a tip slot on the recipt for takeout. I don't feel walking from the kitchen to the counter is worth anything- even if you are cute. However, a few places I regularly do takeout from I tip the takeout people.. Hell, a couple of them in the past have even learned my name. It does lead to better service, but if I never see the same person twice, screw you.
At work.. If we are wearing anything that might identify where we work I tip over 25% as do a few other people on my shift.. Even if we get a discount and even if the service sucked.
One time I was someplace where the service was so awful I just rounded the check up to the nearest dollar. for a tip. I feel a truly shitty tip is worse than no tip.. It sends a message.
I tip the hell out of Chipotle.. I have picked up food on the way to work there a few times and they ALWAYS hook me up with free food, or at least a free drink. Hell, my regular Chipotle even hooked me up NOT in uniform. One girl there even knows my days off- amazing.
Normally, I tip fairly well at a bar.. But one time I had a mojito where I think they omitted the rum- that led to a microtip.
Also, important to note. Cold late food = bad waiter. Hot, late food = bad kitchen. Don't punish the waiter for the kitchen.
I like my coffee how I like my women: Black, bitter, and preferably fair trade.