When I was very young (Like 7 or 8 years old) I was learning to sew on my mother's treadle sewing machine and ran the needle through my thumb more than a few times. I quickly learned not to jerk my hand back but to stop and raise the needle so that I could remove my hand. Don't remember if I got blood on what I was sewing, but I imagine that I did when I jerked my hand and tore the needle out of my thumb.