Ready to blow off some steam after a very productive week? Sure you are. It’s Friday, which means it’s time to whip a handmade origami star at your cubicle mate just to wish him or her a happy weekend. Wikihow runs down the instructions for transforming a simple piece of paper into a four-point ninja (shuriken) star. Looks like another good way to entertain young kids for under a buck. Just don’t poke anyone’s eye out.