Greatest Ever

The Oxbow Incident
Singing In The Rain
Lock, Stock And Two Smoking Barrels
12 Angry Men
The Good The Bad and The Ugly.
The Godfather Trilogy
Gone with the Wind
Double Indemnity
A beautiful Mind
The Shawshank Redemption

This is my personal list of movies that have to be watched at any cost. No matter what genre you prefer if you enjoy movies you ought to watch them.