I try not to hand my card to anyone, so at restaurants that don't give you a bill to pay at the register, I often use cash. We are eating out less and less, so that's all very rare now.
I've been burned by fraud at a restaurant about 10 years ago, but we're not liable anyway; didn't change my behaivior.
The more interesting fraud occurs when the card is all of he sudden used in England for lingerie - and the said card is only used for United Airline tickets.
(inside job)