Picking up food for carry out.,,, bill is $28.65. Pay $30 in cash and say keep it. Waitress rolls her eyes and says yeah, thanks. I am not in habit of tipping for carry out…. There is no special extra service being provided. I drove, went in, went directly to them and paid enough and extra. Yet, is it better to ask/expect exact change than to give the extra, be it not much, to the restaurant?