Be warned, there's blood in the video..
This is a video from my time working as a chef in a sushi restaurant. I had to cut a lot of onions. And lot's of other stuff. I was cutting the onions and I was not in the mood so automatically I started to cut faster and faster. I had never done that before so I asked a co-worker to film it.
I did cut my finger at 0:08 seconds. You can see a tiny red spot. That's where I cut my skin off my flesh XD