It's a good thing that a debit or credit card works via swiping, not via signature. If we had to rely on a valid signature for payments to be processed, a lot of restaurants and staff would be missing out on money. People just love to leave fake names.
This is a particularly impressive example. Apparently, one of the greatest Presidents in the history of the United States of America rose from the dead to eat at this restaurant. We hope he didn't go to the theater afterward.