Animation: Toy Story
Comedy: The Simpsons Movie
Documentary: Planet Earth (Buy it on blu-ray. Beautiful beyond belief. Just stunning)
Superhero: The Dark Knight
Gangster: The Godfather
Fantasy: Lord of the Rings Trilogy, particularly 1 and 3
Horror/Thriller: Jaws, The Sixth Sense (As a South Asian it pains me to say this, but that is M.Night Shamaylan's only good movie)
Musical: The Sound of Music (don't laugh at me... it is the only musical I like)
Romance: Casablanca
Science Fiction: Star Wars: A New Hope, Empire Strikes Back
Sports: Rocky
War: Saving Private Ryan
Western: The Good, The Bad, and the Ugly
Human contact, the final frontier.