Is this site made for the Facebook demographic? I was astounded that there wasn't a poorly-made image macro of a minion with some quip about drinking from a garden hose or rubbing dirt in your wounds to accompany this idyllic gem.
Both of my parents have stories about people getting seriously messed up or killed back in the day by doing dumb stuff on bicycles or otherwise. My father was on a first-name basis with hospital staff when he was a kid because of these types of hijinks and always made my brother and I wear helmets when we rode bikes. If we were skating pads were mandatory too. There's a comfortable middle ground between never setting foot outside and getting your viscera fatally crushed by a 130 lb eighth grader's bicycle tire.
And yes, I've built and jumped kicker ramps, tore my knees open, looped a bike (in both directions), skitched, gone OTB into a ravine in the woods, etc. but the difference is that I never had to go to the hospital or nearly died.
Cool photos regardless but let's not pretend that any of this was smart. Having common sense and wearing protective gear when you have fun is cool, not uptight.