Well that changes weekly, but if I had to pick just one to be stranded on a desert island with it would be the original Robocop(1987) - just so much nostalgia personally but a really great satire ahead of it’s time.
Although next week, I might could say the hilarious meta mindfuck Adaptation. Peak Nic Cage, Spike Jonez and Charlie Kaufman - a really fun and wild ride and I love how self indulgent it is.
Has anyone said Mercy yet?
https://en.wikipedia.org/wiki/Mercy_(game)
It’s not really a fun game though IMO lol