a bit stupid i know but my aim was a tad out and i hit me knee, went for a ride today and dam it hurt

Gutted! 

how! finger i can understand but knee!!

that wasnt very clever was it lol but reading that made me smile were you trying to hit something with your eyes closed?

Could I ask how? I mean its not in a partically easy position to hit with a hammer.  It's like landing on your rear mech, (I've seen it done.)

thought this was for bike related injuries?

haha undoubtedly the most pathetic injury i've seen on here 

come on, hes just posted on a public forum with 7400 users that hes hit his knee with a hammer, and that it hurts. the only reason i can think of soeone doing this is because they want abuse. we can do better than this.
youre a f'ing spanner. what the hell were you trying to do?
next time i hope you hit yourself in the skull or your bollocks, because frankly someone who cant even use a hammer is downright dangerous, and we dont need your genes in the gene pool.