Pucker Factor: ∞
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No helmet!
Link to video -
@Mik Actually not. The book I'm reading off and on,
The Rise of Superman: Decoding the Science of Ultimate Human Performance, talks about many feats of this sort -- like the man who skateboarded across the Great Wall, or the team of men who outfitted themselves with wings and flew off from a skyscraper. That was a bloodcurdler, let me tell you!