My kids play "Hoof, Bandage, Knife" where Bandage wraps Hoof, Knife cuts Bandage, and Hoof breaks Knife (presumably by stepping on it.)   In my opinion, having trimmed a few hooves with a knife, Knife ought to beat both Hoof and Bandage, but when I said so, they both looked at me as though I was being EVEN MORE DENSE THAN NORMAL FOR A MOTHER and both said Hoof beats Knife for the same reason that Rock beats Scissors, and anyway, that's the way we play it.