I watch a lot of music movies, so the obvious one is Purple Rain. Still the only artist to have the Number 1 movie at the box office, the number 1 album, and the number 1 single all at the same time. Not even Madonna or Michael Jackson ever did that.
Aside from that I’d probably pick The Godfather. Genre-defining and damn near flawless.
What are your favourites?
Up. 
I could watch it over and over. It’s also a massive bonding moment for me and my best friend.
Still a better love story than twilight.
Doug 
Oh yes! KEVIN.
Full Metal Jacket
The original Point Break - I’m not proud of it.
Airplane!
And I am proud of it 
What I tell people my favourite film is… 
What it actually is… 
I have three.
The Hours
Which makes me cry like a baby every time I watch it, all three lead actresses are incredible. I once fell out with a colleague for a week because she argued with me about what it meant - she’d decided Meryl was playing a movie of the book adapted by Julianne Moore’s character or some nonsense and I got angry. It’s just three overlapping stories about how Mrs Dalloway affected their lives. Also the novel its based on is incredible, so much happens despite it being such a short book.
The Birdcage
Which I still find hilarious, years after first seeing it, and it feels like there are more jokes every time I watch.
Michael Clayton
I think this is where I fell in love with George Clooney, and Tilda Swinton. (It’s a running joke with my friends that whenever her name pops up, I have to tell them she lives in my home town in north Scotland) The whole film is intense, it gives me chills, you need to watch it a few times to see all the strands coming together. I love the script, the music, the direction, it’s perfect.
Loved the soundtrack to The Hours!
Alien
Jurassic Park
Evil Dead
Back to the Future
https://media.giphy.com/media/MWV32p11ntneo/giphy.gif
Impossible to isolate to a single movie.
Forrest Gump
Ocean’s 11
Home Alone
Hook
Liar Liar
Mrs Doubtfire
Silence of the Lambs
That’s an easy question:
The Room (2003)
I went to a live screening with Tommy and Greg a few months back! So many spoons! Lol
I feel like I need to watch Michael Clayton now.
Epic choices
Definitely The Island with Ewan McGregor and Scarlett Johansson! Ignore Rotten Tomatoes & IMDB, though. 
There is no shame in Bill and Ted, only excellence.
The Abyss. Mr Cameron at his best ( James not David)
The Neverending Story
Entirely nostalgic but I still love it
…and yet you never replied to this thread 
Can’t beat the first Police Academy. Such a great film.