The ending in Barton Fink.
The intermission in 2001 when Kubrick plugs Ligeti to a wide audience, shrouding it all in utter darkness; I love Ligeti in darkness, too.
The ending in 2001 - unsurpassable.
The end of A Clockwork Orange when Alex slooshies lovely, lovely Beethoven... 'I was cured, all right.'
Any scene in The Big Lebowski.
'Springtime for Hitler' performed in the original version of The Producers.
The first episode in The Second Heimat.
The ending in Brazil.
The ending in Eraserhead.
The moment when the kid finds the ear in Blue Velvet.