Original Purpose: Cleaning teeth and gums.
Aha! Use: Slicing soft cheese, cake, and hard-boiled eggs. It's hygienic, neat, and cheap. Unwaxed works best, and of course you know better than to mix mint-flavored with a vintage Gorgonzola.
Reward: Neater food, fewer cavities.
Other Use: As a substitute for kitchen twine to truss a chicken.