haha um...
when i was 7 or something i got a new bike and i raced 2 of my neighbor's friends and i went to pass one of them and i ran into a curb. and being the stupid kid i was i didnt realize i had to do a wheelie before going up the curb and i flied a good 2 feet and messed up my knee. still limp a bit when i do a lot of exercise