haha. He said Hurrasic.
Anyway, my favorite John Williams song from a movie has got to be
Trk #09 - Anakin vS Obi-Wan
And if I had the option of selecting more choices, I'd only have 2 more I favor almost as much, and thats:
Trk #12 - The Immolation Scene
&
Trk #14 - The Birth of the Twins and Padme's Destiny
Imperial March. Classic.
Duel Of The Fates and Battle Of The Heroes from the new Star Wars movies almost single-handedly made OK-ish/borderline shit movies into something more than what they truly are, and it's a real testament to how music can achieve more than what visual trickery can.
Jurassic Park and Jaws are also remarkable. I love tunes like this that tell a story, or paint a vivid picture of what's going on.