ADDED: This story made me remember this passage from Bill Bryson's "The Life and Times of the Thunderbolt Kid: A Memoir" — about being an American kid the 1950s:
In such a world, injuries and other physical setbacks were actually welcomed. If you got a splinter you could pass an afternoon, and attract a small devoted audience, seeing how far you could insert a needle under your skin—how close you could get to actual surgery. If you got sunburned you looked forward to the moment when you could peel off a sheet of translucent epidermis that was essentially the size of your body. Scabs in Kid World were cultivated the way older people cultivate orchids. I had knee scabs that I kept for up to four years, that were an inch and three-quarters thick and into which you could press thumbtacks without rousing my attention. Nosebleeds were much admired, needless to say, and anyone with a nosebleed was treated like a celebrity for as long as it ran.