2 possibles
First one - on a motorbike, idiot van driver pulls out from side road onto a country lane. I'm passing at 50+mph, hit him full-on, taking the engine off its mounts. I bent over the top and slid, amazingly missing the trees, fence posts etc which were in my way. If I'd have hit any of them it would have been game over. Fully destroyed bike, helmet, leathers, boots, gloves.......no bones broken though.
Second one - smashed the front brake on my Enduro in the Alps, thought I'd ride down with just the rear, and on the final (very steep) road section the brake failed. I was doing 30+mph and had no options other than (a) to jump off (b) to hit something to take off the speed. I chose the latter, piled into the driveway of a chalet to try and find something soft to bail onto. Failed to find said soft stuff, hit the wall of the chalet full-on. Astonishingly lucky to walk away from that with just a trashed bike and heavy bruising.