I once had wait staff steal tips from me!
A local restaurant was going out of business as the owner was retiring. It was a good place that I had been to many times and hated to see it close.
Had dinner there on the last day of business, paid with a card and added a tip of $8.00 to the card.
Two weeks later I discovered that the waitress had changed the tip to $28.00.
Taught me to wear my reading glasses and write a bit neater in the future.
Could have disputed it but chalked it up to a learning experience.