The kid that works the counter at Donatos here always gives me a bunch of extra free shit and the family discount, so I tip him and anyone else that does that for me at other places. If they don't, I usually don't tip. I'm picking shit up and leaving, they're not refilling my drinks, bringing me extra shit that I need or cleaning up after me like they would be if I had dined in. And when I do dine in, I normally leave generous tips because they deserve it...unless they suck ass, then fuck them.