My teachers used to stub cigarettes out on us, no wait, that was a dream I once had.The 4 ft long 15mm thick cane was used up until a couple of years after I left high school in 1974,It did similar damage as slaming your fingers in a door just crazy to think this did any good in the long run.Like to try it on them these days and see the effect.Some sick puppys where teachers back then.