Forming a Band?

So K-ON is about a girl band (in high school). They focus on the Rock genre, and I must say, they have a pretty decent sound. But I got to thinking. Would you form a band in school. What instrument would you play? And how would you go about recruiting fellow band members?

As for me, I'd either play the drums or the keyboard. Back when I played Rock Band, I was the only person in my friend group who could hold a steady rhythm. And I learned how to play the keyboard when I was a small child. It's been quite a long time, so I'm probably really rusty at it though.