Here is a scarry one regarding delivery or even take-out. They prompt for a tip at the time of ordering. If you tip then, it is on the credit card, so it can't be cash and if the order is screwed up or delivery is way late, you have already tipped so you can't adjust the tip for poor service. If you don't tip at the time of ordering will the delivery person, think you might not tip and treat the order as a lesser priority.

TEK