Can't truly say that it was the first film I went to as a child, but I remember that my mom took me to the "Sound of Music" when I was a small kid.
Unfortunately, I suffered from vertigo as a child, and when the copter shot came in at the beginning of the movie, taking the movie-goers over the beautiful spectacular views of the Alps before panning in to Julie Andrews, by head started spinning and I started throwing up.
We left, and I really think that was the last time I ever went to a movie with my mom. She really loves that movie though.