I love Classical, and I'm pretty sure I can peg it back to watching cartoons growing up. Most of your basic classic cartoons (Warner Bros., Disney, Tom & Jerry, etc.) had classical scores throughout. "Rhapsody Rabbit" = Franz Liszt's Hungarian Rhapsody No. 2, "What's Opera, Doc?" = Wagner's Ride of the Valkyries and excerpts from his Der Ring des Nibelungen, and of course Fantasia is one giant classical piece.
I also watched a lot of Olympic figure skating growing up, and most of those performers chose classical pieces for their routines.
And, of course, movies. Most movie scores are simply modern-day classical pieces anyway. Of all the CDs in my collection that are soundtracks, the majority of them are movie scores rather than the songs from/used in the movie.