i dont even know. worst thing i've ever done was break my heel into 3 pieces but i didnt even fall. i guess my worst fall was probably an attempted front 4 out of an up box with waay too much speed, landed sideways, not sure if i under or over rotated, my edges dug and i just slammed straight onto my head. thought i was alright, got right back up, started skiing down the run, got all dizzy, fell over and started puking. sweet concussion.