Alright, 3 worst that I can remember.
1. Try to air as high as possible out of a 5' quarter, ran as fast as I could, dropped down a bank, hit the quarter.... and scraped on the coping. Scooter never left coping, I went soaring up like a flying squirrel... flailing, and then fell on the coping, half on and half off (OOOOOOMPH) ... then rolled down to the bottom.
2. Tried an alley oop bri on a hip. Old bolted pro model and one bolt was 1/2" too long. Sliced my leg open swinging the deck back and lost so much blood I had to get driven to the hospital.
3. Just happened a couple weeks ago, was running as fast as I could to get speed to drop down a bank and then gap over a box. Made it to the bank full speed, and a 2 year old waddled in front of me. Twitched the front end and took my foot off to slow down and just INSTANT lawn dart. Went flying over the bars, through the air, cleared most of the bank to flat... and just skidded across the concrete, barely clearing the kid by a foot maybe... to the right. Was amazingly alright just had a bit of concrete burn...