Backyard roller coasters
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Other homebrew coasters I've seen don't look quite as well thought out. As much as I crave the adrenaline rush, I'm not that keen on adding the risk of genuine bodily harm to my roller coaster experience. But some folks are happy to throw caution to the wind, and God bless 'em. Some of my favorite examples:
PVC pipe, rollerblade wheels, and no restraints whatsoever? Hop on, kids! (location unknown)
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Blue Flash by John Ivers (Indiana)
So sweet it's almost worth the stitches! (location unknown)
Built by boy scouts (Denmark)
Timber: under construction (upstate New York)
Finally, a humorous guide for the intrepid DIYer.