Give me just the tip not a stiff: start at $3 increase by $1 if you live far from the store. Increase by $1 if you made special requests and I got them all right. Feel free to increase for any other reason (you're feeling generous, you think I'm hot, etc). Remember that almost any bad customer behavior can be smoothed over with a good tip.
Don't be a dick: I don't think you're funny (unless you're tipping well), I'll be nice to you and I expect the same, and if you invite me inside (unless you're a little old lady with a broken arm calling me Mamushka) I will think you want to lure me to my death.
Damn straight this came from my iPhone