i tried a backflip over a 8 foot jump with barely enough pop so my skis wouldnt drag on the deck.. rotated a little to slow.. my tips caught the knuckle.. flung me foward.. i dont remember from then on untill iwas at my house with a broken elbow and a decent concussion... i dont remember about 4 hours worth of time.. pretty gnar when i still try to think what i was doing and cant remember