Many movies had great opening scenes. For the 'younger' generation, the opening scenes that may come to mind would be Star Wars and Indiana Jones. These are scenes that grab you by the throat. These are scenes once you see you know you are in for a cinematic treat.
To me, one opening scene stands out above all others. No it's not Citizen Kane. But it is by a movie directed by Orson Welles.
It is his opening scene for the movie Othello.
Just look at it below. It's in glorious black and white and it is pure cinema.