I got interested in Classics because of Walt Disney's Fantasia.
I saw the movie when I was five or six, and really loved the segment with Beethoven's Sixth Symphony (a piece of music I still love, by the way). Of course, now I find it amusing how the Disney animators mixed actual mythology (thunderbolts forged by Cyclopes for Zeus) with pure fancy (a whole family of winged horses when Pegasus was the one and only)!
Whatever. My five year old self was captivated, and I wanted to know more. A few years later, I found D'Aulaire's Greek Myths at the library, and really started learning about mythology. As I got older, my interest spread to other cultures besides Ancient Greece and comparative religions as well. In high school and college, Joseph Campbell was my hero. I'm still interested today, and honestly the interest in comparative religion has done much to inform my own (rather unconventional) religious views also.