I had various injuries from park playground equipment, Witches hats, climbing frames, rocking boats. most including cuts to my head, skin left behind on the tarmac surface, you know the sort of thing. I did once burn my back quite badly one summer day on the big slide in the park, the slide part being lengths of brass sheeting screwed to the wooden base of the slide. On a hot day, it must of been 1967 or thereabouts I came down the slide with no shirt on and laid down on the slide as I had done many times before but normally with a tee shoot on. Many large blisters and quite a lot of skin left behind. It took quite a while to heal up.