Animation- WALL-E
Comedy- Monty Python and the Holy Grail (The Mask and Ace Ventura are also up there)
Superhero- The Dark Knight
Gangster- Oh Brother Where Art Thou? (Only one I could think of...)
Documentary- The Corporation
Fantasy- Lord of the Rings Trilogy
Horror/Thriller- The Shining (1980)
Science Fiction: Star Wars Series
Sports: The Longest Yard (1974)
War: Saving Private Ryan
Musical: Sweeney Todd: The Demon Barber of Fleet Street
Haven't seen that many Romances or Westerns though.
Member #50 of the Sonic Support Squad! :P