I don't think anyone was advocating endangering a child with power tool or the like. I remember 7th grade industrial arts class, it was shop back then. My teacher had us working with tin and snips. Sounds relatively harmless right. He even warned that the cut edges of the tin was sharp. I must have been in the bathroom for that part, because I had to learn the hard way.

I do remember that the cut edges of tin are sharp.