I took up drumming almost a year ago. I'm kicking myself for not taking it up when I was a kid. I've never taken a formal lesson and most of what I've learned is strictly from playing along to Led Zeppelin, James Brown, RATM, and Nine Inch Nails. Once I learned how to play "When the Levee Breaks" and how to do the classic Bonham bassdrum triplets, my learning curve went through the roof. I've picked up on it so quickly that I think if I had started a long time ago I'd probably be playing professionally in some sort of band.
I'm playing as the opening act with my roommate for my buddy's band next Monday at this local bar. He needed a band to open up after the original opener flaked and I jokingly told him my roommate and I would play on drums and bass while he freestyled as the opening act. He thought I was serious and said sure. So we're just getting together some basic grooves so we have enough shit to play for about 20 minutes or so.
I can't wait. I've never played live like this before. I'll just be playing some basic hip-hop-type beats with some no-frills fills thrown in, but my roommate and I can just groove forever without fucking up at all as long as I keep the fills simple and sparse and don't try to start changing time signatures, and he's extremely good on the bass so if I just play whatever and let the beat morph from one to another to another, he keeps up really well. I plan on throwing in some four-on-the-floor/disco type shit too, just for the fuck of it.
So that's my hobby.