Depends what mood I'm in. Perhaps I'm weird. I'd rather not watch a movie.
Withnail and I.
Bleak, hilarious, eminently quotable, and painfully familiar to anyone who's been a flat-out broke artiste (with a fancy 'e' on the end) of any kind.
Other than that, I also love Brazil, The Good The Bad And The Ugly, Bronson and This Is Spinal Tap.
Terry Gilliam is one of my favorite directors, and Brazil is one of my favorites!
Blade Runner 2049
@Akfishlady I thought it was a flawless sequel. Worthy of the original while standing on its own, which is what every great sequel should do.
One of the few sequels which is as good as the original.