It's been written before that Guitar Hero is prime Silicon Valley fodder. But sometimes you can't really understand just how big something is until you see it with your own eyes.
In the San Jose airport, at least four guys were sporting guitar-shaped controllers strapped to their backs. Two of them were on the same flight. Was there some for of Guitar Hero tourney going on? Nope -- at least according to the guys. (To be fair, one of the travelers said his guitar was for Rock Band).