My sister did the nearly shooting someone in the foot thing on the training course with a bouncer, but the best one I've seen involved my parents.
My sister had purchased a (from what i can gather) 4th hand bow. Shoots fine, few scratches etc. My mom had a go at shooting with my sister's bow, hit the target stand and the arrow came spinning backwards through the air before striking my dad (who was behind where we were shooting from) in the knee.
It could have been an outtake from the Matrix or something like that. the way it happened. It was almost in slow motion just watching the arrow cartwheel backwards towards it's unintended target.
No injuries, but gives you a real shock when you're not expecting it.
I'd also like to point out there had been no arguements prior to the incident and it was a genuine accident. Pretty funny though
*If only that camera had batteries*