In my restaurant days, when somebody would order on the phone and then come pick it up, I'd get a tip maybe half the time, and have no fucking idea why. I really just bag the stuff in the kitchen and bring it to the door and run their credit card. Sometimes they'd give me $5 for a small order and I felt like I was supposed to dance them a jig or something. But whenever anybody dined in and I gave them my awesome service, and they stiffed me, I never made sounds or gave them looks. It usually averaged out where my next table would overtip me and I'd break even at 15-20%.