One of my DD's is similarly talented. When she was 7 she cut the tip of her little finger on one of those plastic saucer sleds. Her finger looked like it had been cut with a potato peeler, we ended up making a trip to the ER for stitches, which had to be followed up with trips to a plastic surgeon (because there was concern about the blood flow to the hunk of skin that had peeled back). DH went over the sled trying to find where she had cut herself, but didn't find any sharp edges. We just ended up pitching the sled. We still occasionally tease her about how it takes talent to cut yourself with a plastic sled, I will have to let her know that she is not alone in this talent.