HI-YA! DIY Karate Chop Bottle Opener
There are many ways to open a bottle, but you have to admire the simplicity and karate-esque action required in Instructable member Carleyy's scrap wood method. Don't be deterred by the use of power tools in the video below. All you really need is a piece of scrap wood, one nut, and one bolt.
Click through for instructions.