Napkin

One should always make sure to have a napkin at the ready when preparing to battle the Demon Monsters. Without a napkin, one might accidentally fall off the cliff and lose three health points.

As a result of the great value of napkins, they are often kin-napped by nefarious kin-nappers. Should this happen to you, you'd better locate the napkin or another of its kin as soon as possible and wake it up from its nap. Napkins are notorious nappers, you see, being of a kin especially prone to napping.

It also makes for a good Bill Wurtz video.