well i was doing some jumping and it was a high jump but as i comeoff the ramp , as i was up in the air then i lost grip and came off the bike, the ground was grass but i didn't see the rock that was in the ground so as i fell to the ground i land on the rock and cracked my knee cap (broken it in half) it hurt alot not so long ago i was biking back from skool and my bag was scraching the back wheel so i put my hand on the bag to hold it up but after a 5mins i got tired and relaxed my hand and put it on the tyre bad thing to do i was going alond quickly and then i ripped off my nail but its good now