Okay...

Comedies:

A Fish Called Wanda
Groundhog Day
Ruthless People
Love At First Bite
Raising Arizona
Almost anything with Peter Sellers in it...which includes the Pink Panther movies, The Party, The Mouse That Roared, Being There, and others...

Westerns:

The Magnificent Seven
A Fistful of Dollars
A Few Dollars More
The Good, The Bad, and The Ugly
Butch Cassidy and the Sundance Kid

Indians:

Dances With Wolves
Windwalker
Last of the Mohicans (the one with Daniel Day-Lewis)
Son of the Morning Star (a 2-part series)
Geronimo
Little Big Man

War/History:

Lawrence of Arabia
Das Boot
Damn the Defiant
Gladiator (for the amazing scene in the German forests)
Empire of the Sun
Seven Years in Tibet

Adventure/comedy:

Romancing the Stone
Pirates of the Caribbean (AAA+++!!!!)

Film Noire:

Anything with Humphrey Bogart in it...
And better yet with Lauren Bacall and Bogart!
Body Heat (yowsa!)(Kathleen Turner as the greatest vamp of all time!)

Winona Ryder flicks:

Beetlejuice
Welcome Home, Roxy Carmichel
Heathers
Bram Stoker's Dracula
Mermaids
Reality Bites
Little Women

(I enjoy almost any movie with Winona in it...almost...)

Horror:

original King Kong
original Godzilla
Bram Stoker's Dracula

Cops 'n Robbers:

The Fugitive
Dick Tracey
Bonnie & Clyde
The Untouchables
Mobsters
Miller's Crossing

Sci-Fi:

Original Star Wars trilogy
Total Recall
Terminator 1,2, & 3
One or two of the Star Trek ones...with Picard

Animated:

Pocahontas
Mulan
Lion King
Ants
Dinosaur
Toy Story

I guess that'll do for now. One could go on almost forever at this...