Disclaimer: This toy is fun but also dangerous. My kids love it, but my wife hates it. You can't steer, it's spins you 360 degrees and is prone to flip. Enjoy!
Here is a little clip of it in action.

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When your kids get racked (the violent interaction between the the crotch and an immobile object) by the stop sign at the bottom of the hill you must immediately take them back up the hill and send them back down head first so they won't remember who to blame when they can't have kids when they become adults. ;)