Re:Sale has already been completed (Score 2, Interesting)

If I'm at a restaurant and the check arrives with some of the items I ordered absent from that total, I am probably going to assume that the waiter comped them to me, and leave a generous tip. No sneering involved.

As a former food-service worker, you are 100% correct. You leave the difference as a tip and you don't have to worry about tipping above that number. It's called "a Win-Win". For the record, most restaurants throw more food away than they actually serve to customers. But I digress...