Apollo 13.

Mostly factual, great pacing, gripping story, excellent acting, and an honest feel-good ending,

In fact, that and The Incredibles are two movies that I could show to almost any crowd with confidence.

Kiss Kiss Bang Bang.

Dredd

Something that everyone will love, like The Room or maybe Samurai Cop or maybe even Hard Ticket to Hawaii.

Depending on the group, sometimes old Jet Li flicks will work, too, like The New Legend of Shaolin / Legend of the Red Dragon which has some great baby-kung-fu.

For me, I could watch Muppet Treasure Island over and over. The perfect movie.

For a movie I need to play for others: A Goofy Movie.

Its a really long movie but it's got everything. RRR

Its got bromances, romances, comedy and tragedy. It's got plenty of over the top action and musical dance numbers. 10/10 movie.

Any of Simon Pegg's movies (the trilogy of sorts).

Requiem for a Dream

Since someone already said The Princess Bride...

Penguins of Madagascar, The Movie

It is the funniest film I have ever seen. Starring John Malkovich as the villain and Benedict Cumberbatch as the other villain.

Amelie

Contact.

Repo Man. If they don't like it, I don't want them around.

The truman show

Ghostbusters.

This is a perfect time for the Christmas cracker approach - you're unlikely to be able to pick a movie that everyone agrees is good, so pick a movie that everyone agrees is bad, and bond over shared mockery.

Space Truckers (1996) - Dennis Hopper, Charles Dance. Terrible movie with some wacky bullshit, cube pigs, neon space twinks, and a cyborg love prosthetic.

Moonfall (2022) - another classic from Roland Emerick where most of the movie is nonsense but there is a seed of a brilliant idea buried in there.

Mega Shark Vs Mecha Shark (2014) - it starts with a giant shark catapulting a fishing boat from Manhattan to Giza, and gets more and more ridiculous as it goes on. Featuring Christopher Judge in one of his less believable roles.

Super Troopers.
"You boys like MEXICO?!?!?!"

Since no one has said it yet, original Ghostbusters.

Either "Tucker and Dale Versus Evil", or "The Cabin in the Woods".

If I want everyone to leave as quickly as possible, then "Martyrs", Antichrist", or "A Serbian Film".

Empire Records just felt good and I think it could pull that off with a crowd.