@tsarstepan,
Holy crap, the manager copped an attitude with him because he immediately returned the money? The customer hadn't even left the drive through when he took that video.
"We would have called the authorities on you." instead of "OMG, THANK you so much for catching that and being honest"?
If I were the customer, I would have said "Uh..excuse me? You're threatening ME when I just saved your ass?"
I'll bet he's a pleasure to work for. Maybe some other employee put that in there to mess him up.