Say you order take-out from the restaurant down the street. They don't deliver, so you go to pick it up. When you arrive, your bag is waiting for you at the front desk. The bill is given to you by the guy at the desk. You pay by credit card. Do you leave a tip in the space on the bill, or not? I have waffled about this and done both. On the one hand, I don't want to stiff anyone. On the other hand, I don't know who I'm tipping, and I'm doing most of the leg-work. What do you do?