Paragliding - leapt off a hill, 200 feet up, completely out of control on my second ever flight, I zigged when I shoulda zagged. I powered into the back of the instructors parked van at a huge rate of knots, smacking feet-first into the rear door panel, to deathly silence from about a hundred observers.

I lay there for a bit, winded, but eventually after I counted my limbs I figured there was no damage (thanks to cycling thunder-thighs), aside from a bruised ego, a huge dent in the van and shame in the eyes of the gorgeous blonde I'd been trying to impress.

Couple of feet higher I would've gone through glass or been speared on the roof rack by hang-glider poles.

About a month later another novice glider died at the same spot, power lines rather than van door.

Memo, if you're unco-ordinated at all sports except E-sports, do not do paragliding.