Spyderco's new flipper pen, the BaliYo, should be available in two days. The pen portion is a Fisher Space Pen. I don't know if the entire thing is sturdy enough to use as an impact tool, but I would think it would definitely be a cool practice piece to take anywhere, and work on your manual dexterity!
Here's a cheesy video.
John
Here's a cheesy video.
John