I held up an express line at the supermarket 1/4 mile away earlier in the week, as I made the cashier pull the two bills I had given her--a $20 and a $5, as the cost was $24.51--and she was giving me $10.49 back in change. I looked at her and said, "Are you sure that I'm supposed to get that back? I gave you a twenty and a five." She must have had other things on her mind (she was in her 60s), because it took about 30 seconds for it to register in her mind. When it did, she thanked me profusely, and I walked off. Hopefully, the people behind me learned a little lesson in honesty--but probably not.
What goes around, comes around.