In no particular order, here are 50 movies that i think everyone should see:
The Shawshank Redemption
The Good, the Bad and the Ugly
Fight Club
Star Wars (all of them)
Pulp Fiction
Inception
The Prestige
The Usual Suspects
Lucky Number Slevin
Lord of the Rings (all of them)
The Godfather (all of them)
Raiders of the Lost Arc
James Bond (at least one of them)
The Matrix
The Silence of the Lambs
Forrest Gump
A Clockwork Orange
Saving Private Ryan
The Shining
Alien Vs Predator
Monty Python and the Holy Grail
Full Metal Jacket
Gladiator
Inglorious Basterds
Die Hard (all of them)
The Dark Knight
The Great Escape
Jaws
Bladerunner
Slumdog Millionaire
District 9
Snatch
Lock, Stock and Two Smoking Barrels
Kick-Ass
Braveheart
The Sixth Sense
The Bourne Identity
The Bourne Supremacy
The Bourne Ultimatum
The Terminator
V for Vendetta
Star Trek
Saw
Rocky
The Exorcist
King Kong
Million Dollar Baby
Schindler's List
Se7en
If I've missed out anything obvious or if there are typos etc, please let me know. Otherwise feel free to leave some interesting & constructive comments. Thanks for reading :).