I think shop classes need a safety video of some unfortunate person getting chopped to bits to clarify any doubt about following safety procedures.
On www.darwinawards.com, there are loads of these unfortunate cases.
I read about some unfortunate kid, whose job was to chop up ice blocks for fishing boats. He had been told explicitly to not touch the remnant that would be left at the end of the day, as for it was only a few pennies worth.
At the end of one shift, the remnant ice block got the better of him and he ever-so-carefully attempted to nudge the remnant through. Unfortunately, the ice chipper grabbed him and it cost the boat owner $30,000 to clean the boat.
There is no common sense today anyway.
At that same shop after the kid had his unfortunate episode of pilot error one of the old timers said to me. “Your generation were dumb greenhorns when you walked in the door but you weren’t stupid like the kids today.”
In my shop class the teacher screened the film Don't Push Your Luck. It was pretty gruesome- perhaps today's school officials are worried that it might traumatize the little darlings.