Because I'm a dork and have been talking about this game on and on and on. Here's a long video explanation. Skip it or fast forward as you like cuz it's 6 minutes. But I'm addicted.
Here's another video (shorter, less than 3 minutes) of a bunch of grown men playing this game in public. So don't be hatin' on me for being such a geek.
BTW, jimmy's also developed an 'injury'...drummer's carpal tunnel. I won't let him take any time off. What's that saying? "Play till you bleed?"