Good ones, OTG.
To that I'd add:
The Third Man
The Seventh Seal
Arsenic and Old Lace (need some comedy)
How about horror?
Frankenstein Meets the Wolf Man (with Boris Karloff and Lon Chaney Jr.)
Invasion of the Body Snatchers
> Grapes of Wrath
> Citizen Kane
> The Magnificent Ambersons
> Stage Coach (John Wayne version)
> High Noon
> Maltese Falcon
> and of course....
> Casablanca!