As the maxim states, “Different strokes for different folks.” That is great as far as it goes but these antics are downright dangerous, death defying even. Either they cannot foresee the consequences of their actions or they have a death wish. Whatever it is, does not make a difference, as either way, they will not survive to old age.
Or maybe I am a wussie and too risk averse.
Main picture: Would you allow somebody to angle grind using your back as a work bench?