Okay, so I go to Sonic. But for the first time, I park in one of the parking spots with an ordering thingy instead of doing drive through. I just order milkshakes and pay with credit card. Anyway, a dude delivers our drinks on a tray and that's that. Then, I'm thinking after the fact, "Was I supposed to tip the delivery person?" He did serve us, but it's almost on par with fast food service. Have you been to Sonic pull-up/park/order and tip the delivery person/waiter-ish person?