Other than one spill mishap of a martini tipping over on a tray and showering a bald customer's head and eyeglasses, (in 1975) about all I ever did was foget to charge wine twice. Policy was to pay cost the first time and full price any time thereafter. I insisted both times to pay in full because of a personal belief that the more expensive an error is the better it prevents re-occurance. The expensive one was $72.00, but that was in the 1970's.