Something screwy like this happened to my aunt once. She always tips in cash, but she had neglected to zero out the area where the tip goes. The waitress went so far as to give herself a big fat tip and then wrote a comment about how great her service was that evening.
My aunt, being the watchful plastic user that she is, noticed the charge and brought her receipt back into the restaurant. The manager even remembered the receipt because of the comment. They reversed the charge.
This taught me to always zero out the tip line if I'm tipping in cash. I put what appears to be a big "Theta" through it so there's no mistaking that it's a zero with a line.
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