These are my favorite movie moments of all time. Maybe not the best moments in the film or even of all time, but MY favorite moments. I know it's a little Spielberg-heavy, but what can I say? The perfectly put-together scene is one of his greatest strengths.
Neo and Trinity Enter the Lobby
Glenn and Dot Visit in Raising Arizona
When John Hurt has a Stomach Ache in Alien
The TRex Attacks in Jurrasic Park
Greatest buildup of suspense and general maintenance of tension EVER.