When I was little I topped off my mom’s oil with 5 quarts, while my dad was out of town. Then another time I put a spare on her car and had not learned to cross tighten the lugs and the wheel almost fell off. Both incidents occurred before I had a drivers license. This last weekend I was doing ball joints on my brother’s HHR used may power tools but busted my finger open reassembling the joint requiring 3 stitches.