Usual Supects & Fight Club - totally diferent movies on 2nd viewing.
LOTR - 'Fly you fools...'
Recent realistic war movies - Saving Pte Ryan, Blackhawk Dwn - should be required viewing for politicians.
Python but not Meaning of Life - that was just odd!
Excalibur - 'Any man who would be a knight and follow a King....follow me.'
Nikita - best foreign film.
Matrix - only if you don't know the plot :)
Anything with Anthony Hopkins - 'Goddamn you, man. Don't you bloody contradict me.' (Captain Bligh, The Bounty)
Brave Sir Robin