Daddy, how to you rip off a cd/dvd store?

There was one fine afternoon several months ago in which a man came in to the store with his 6 year old daughter. He was carrying a copy of "Who Framed Roger Rabbit", I think it was.

He says "I borrowed this from a friend last week, and he failed to tell me that it doesn't work"
I says: "Did your "friend" include the receipt with the DVD?"
He says: "Well, no"
(Daughter watches on... learning from superhero daddy)
I says: "Well you can't just return a random DVD without a receipt, and we also have a seven day exchange policy"
He says: "Tell you what, I'll just leave it here" (throws it on the counter, raises voice considerably) "You can rip someone else off with it now" (storms out of the store like an angry 6 year old, with 6 year old daughter in tail)
I immediately tossed the DVD in question in the garbage. Had he not been with his daughter, I would have thrown it back at him outside, and that would've been fun!
I never had a chance to inform him that we BUY DVDs here, or to point at the big signs that read the same. I suppose he's illiterate.

This man must be super busy with his really great friends, and all the while raising & teaching his daughter how to act in public and conduct business.