Happened when I was 14.
I was a freshman in high school, and was the music reviewer for the school paper. I was getting to a point where I wanted to try and 'break' a band or album to my school peers. Change the music scene, you know?
Of course, I was 14 and didn't listen to much music outside 'good' MTV rock bands (Green Day, RHCP, the like).
At this time, I had never heard of Radiohead, but when I was looking in the CD store and saw the cover to Kid A, I was just drawn to it. I thought I had maybe heard of the band before, and thought I heard something about the album being good, but not a damn thing else.
That night, I put it on my dad's hi-fi when no one was home and put it just loud enough where I could get completely lost in it.
It was mesmerizing, enchanting, amazing...
I didn't know enough about music, I guess, to be put off by it. I was listening to it with completely open ears. When I heard Thom Yorke's voice on the title track, all digitized and muted, it was one of the most exciting things I had heard. The opening keyboard synth drones of "Everything In It's Right Place" were infectiously planted in my head from the first time I heard them.
I tried to get my friends into them, and they'd make fun of me. When they were juniors and seniors in high school, I'd hear them talking to people about how badass of a record Kid A was and laugh at them and point out when I first made them listen, they mocked me profusely for liking it. They'd look down at their feet all sheepishly and I'd laugh.
After listening to Kid A, I looked up reviews on the album to help write mine. I came across a pitchfork Top 20 albums of 2000 list which included Sigur Ros' Agaetis Byrjun and Modest Mouse's The Moon And Antarctica. After downloading and loving those two albums, in addition to Kid A, I was gone down the indie pathway for good.