The first time I was ever in a machine shop, one of the operators didn't clamp down a part with enough force. It was a little steel block approximately 1x1x3. I

The first time I was ever in a machine shop, one of the operators didn't clamp down a part with enough force. It was a little steel block approximately 1x1x3. It shot out of the setup across the room at a speed comparable to a baseball pitch. It missed my head by about 6 inches. Had it hit my head, I'd be dead. A circular saw isn't a toy either, but it's pretty hard to accidentally kill someone with one from 20 feet away.