I became very, very obsessed with Titanic at age 7 when the movie was released. Had so many fiction and nonfiction books, I built models, I played the PC game, had the soundtracks, I visited museums, I could name 50+ members on the passenger list. I drew the sinking ship several times, even once mailing it into the local newspaper drawing contest (they never printed it). When my brothers would go surfing, I'd sometimes stay on the shore and build the Titanic on my board, sandcastles for smokestacks, seaweed for rope.
I'm 99% sure this all arose because I had a gay crush on Leo. At that age, I couldn't really identify it (or my orientation) as such, but I definitely knew thinking about him made me happy.
My brother liked the movie for other reasons, I think. We sold the humongous VHS tape at a garage sale, and the buyer wanted to test it on a TV to make sure it worked. The tape was rewound exactly to Kate Winslet's nude couch scene. Oops!