Perfect scenes in movies?

The car chase in Bullitt.
Duelling Banjos scene in Deliverance.
Transformation in An American Werewolf in London.
Traffic jam scene in Sicario.

If I think of more I'm gonna add them later.

Not a great movie (or even that good really) but the opening of Snake Eyes filmed as one extended shot following Nicholas Cage as he makes his way through the Vegas arena toward his seat was really well done.

The Chicken Wings scene in Tommy Boy

The last scene in Some Like It Hot. The end is hilarious, in fact the whole film is hilarious.