I grew up mostly with classical, big band, and a lot of Irish music - I really didn't start listening to rock and roll until I was maybe sixteen.
A friend of mine, that I had known for some time, came up one day with an old guitar. I don't know where he got it, I don't know how long he'd had it, but he knew about two chords on it. He proceeded to teach them to me, and then we proceeded to go crazy over music.