Take your pick:
1. A cook, using a deli slicer, not using the safety guard but using his hand instead accidentally chopped off his thumb clean thru while not paying attention. In the panic, he was sent to the hospital without the severed thumb packed in ice. By the time he got to the emergency room, the surgeons said it was too late to go back and get the thumb because the severed thumb's nerves would have already died. They gave him the choice of being without a thumb or amputate his big toe and attach it as a "thumb". Being a lifetime cook, he chose the latter since without a thumb, you can't do much in a kitchen. He came back to work around 6 months later and the big joke in the kitchen for awhile were variations of "I smell toe cheese" jokes.
2. Young cook who was new to shucking oysters but being trained one night found himself "in the weeds" buried under a mound of tickets with more incoming. Instead of using a rag to protect his hands, he felt he could go faster with no protection. As he was trying to open a particularly stubborn oyster, the oyster knife slipped and impaled his open palm and came out the other side. He went to the emergency room and came back to work a week later with a hand so swollen that we started calling him "Mickey Mouse". A few weeks went by and one night the same guy who was cleaning out his station and the inside of his chef table refrigerator, all of a sudden, started shaking while smoke was coming off him and then dropped down with a thud. There must've been a wire short somewhere and the water being splashed around along with the wet floors basically got him electrocuted. Ambulance came again and although he was alright, he decided to quit working in kitchens.