I'm also reminded of an experience I had while working in the food industry.
Our prep guy had quit/not showed up and I volunteered to do the morning prep since we were in dire need. I was out LATE, and didn't actually get any sleep. I made it until about 1pm, and was slicing tomatoes on a meat slicer similar to the one pictured below. I was dead tired, and my concentration started to falter, so I turned the thing off, and went to the MOD and told em that I was falling asleep, and that they would have to make due with what I had done up to that point.
http://www.alliedkenco.com/catalog/i...T%20SLICER.jpg