Parasitic Socks

Deep in the tropical jungles hang thin creeper-vines, bearing colorful blossoms full of sweet and inviting fragrances. But be careful of these vines, and make sure that when you have passed, none have fallen upon you, to twine into your clothes, and grow there. These are the dread Parasitic Socks, which can only take their own form and shape by stealing that of another. And, alas, if one sock knits itself out of the yarn of a second, you will never have a pair.