I've seen that kind of thing personally... Had a guy on a job I was inspecting decide that he needed to clean the auger of a large highway boring machine while it was running! It caught his glove and ripped his arm right out of it's socket!!!
I just try to keep in mind that metal is harder than flesh:shock:!
My dad used to teach Building trades at the high school when I was growing up. The first day of class he would bring a package of hotdogs and take all the teenagers to each machine and show them just what thier finger would look like if they got it too close... He always said that at the end of the day, you could still count to ten on your fingers then it was a good day!