Monty Python
I've always been a Python fan, and for me the best one they did was Life of Brian, followed by Holy Grail.
I personally think that Life of Brian should be part of the school curriculum for all English speaking teenagers, as it brilliantly satires all the woke stuff we see today, even though it was made back in the 70's.
Other films.
Sci fi
Chronicles of Riddick (the longer version) epic sci fi on a really grand scale
2001 (it was made here in Elstree/Borehamwood and Kubrick lived just up the hill in a big house that overlooked the studios)
Star Wars (all of them. Nos, 4, 5, and 6 were made here in Elstree/Borehamwood, where I live)
Star Trek (all the movies)
Close Encounters of the 3rd kind (enhanced edition)
Alien, and the long version of Aliens (it was totally different from the cinema version)
Predator and a couple of the sequals (good effects, and some humour in the sequals)
Day of the Triffids (beware of shooting stars and plants that can walk !)
Brazil (it's what 1984 should have been)
Stargate (the movie that the series came from)
Starship Troopers (1, 2, and 3)
Babylon 5 (the 3 movies that grew from the series)
Dark Star (how many of you have heard of that one?)
There are loads more, but as usual I can't think of them right now
Comedy
Anything by Mel Brooks, but particularly;
Blazing Saddles (definitely the best he's ever done!!)
Silent Movie
Spaceballs
Other comedy
4 Weddings and a Funeral
Bridget Jones (all of the movies)
Grease
Adventure
The Indiana Jones trilogy
Bullit (best car chase ever!)
Fantasy
Lord of the Rings (all 3 of the extended editions)
House of the Flying Daggers
War films
The Battle of Britain (real planes, not cgi)
Sink the Bismark (real ships and planes)
Tora Tora Tora (again real planes, not cgi)
Murphy's War (sad war film, but excellent flying sequences)
As usual, there are many different films for different times in one's life. For instance, I remember Bambi when I was a child, Pinnochio, when I was a bit older, and Fantasia when I was an adult, were all stunning cartoons, as well as Snow White, and much newer, the Shrek series of movies