We went out to eat and paid by CC as usual. The server added an extra dollar to their tip, which I found odd. Why? I've waited tables in college and would never have tried to pull a fast one on a client. I'm stunned that someone would be so dishonest.
I caught it after the statement came, so I didn't feel like complaining. But now I'm a lot more careful and check every restaurant transaction immediately as it posts. That way the stores will keep the receipt handy.
I posted on another website and apparently this is can happen quite a bit. It happens with both Debit and CC. It appears as long as you tip on plastic of any sort this can happen. Also sometimes waitstaff accidentally double charges you as well.
So keep an eye on the receipts and check everything twice.