If you ever find yourself in a pinch with only a sheet of paper between yourself and your enemies, knowing a skill such as shuriken-folding could well save your bacon. So here's a link explaining How to Fold a Shuriken.
Of course Fudebakudo has this to say about origami. There are also the remarkable downloadable slippers — once you've mastered that technique you never have to buy another pair of shoes again. In fact, there are probably cobblers out there whose businesses were ruined when Fudebakudo combined the technologies of origami and internet. Sorry cobblers.