When I was a hostile, jaded, stoned senior in high school, I saw one of my classmates reading a book with an interesting looking cover. It was The Hobbit. I asked her what it was about, and she said it was too hard to explain, but that it was the best book she had ever read. That evening, I went and bought a paperback copy. The next day I skipped school so I could continue reading.

Next, I read LotR, The Silmarillion, and everything else by Tolkien that was available. Next, I had to know about runes, and Norse sagas, so I found some excerpts from the Elder Edda at the local library. I read all the fantasy I could put my hands on (except Terry Brooks, who I tried immediately after reading LotR, and despised), branched out into SF, mythology, linguistics, paganism and so forth. Because I was so interested, I cleaned up my act and went to college, then grad school.
It really isn't exaggerating to say that LotR changed my life.