Happened where I worked once. Employee didn’t enter the decimal point and charged $1875 for a $18.75 item. Customer called next day and it took 5 minutes to fix and also comped them the original charge for the worry we had caused. They’ve been back a ton of times since.
The waitress had actually charged me three times for an approximately $80 meal. One for $79, one for $82, and one for $820. But the manager was mad at me about it.