Around 40 years ago I was using an electricians knife to cut a piece of plastic rod. When the blade finally made it through the plastic, it continued on into my thumb all the way to the bone. Being afraid to tell my mom, I wrapped it as tight as I could with toilet paper and black electrical tape. It finally healed on it's own but to this day, my thumb print doesn't line up where the scar is. Can't stress the using the right tool for the job and using it correctly!