It's the Real Cheap Thing

A large Coke at McDonald's is $1.35 (plus tax). If you take back your empty cup and ask for a refill (even at the drive-through), your large Coke is $0.49 – you save $0.86 each visit. Now that I have told you, I think you should send me half. You would still save $0.43 and I would be happy.