Hot Fuzz. One of the best movies of all time.

Tucker and Dale vs Evil

Idiocracy is the funniest comedy I've ever seen, but its becoming like a documentary of our time now.. And that wasn't intended I think.

Is Kung Fury uncommon enough? Most people I talk to irl never heard of it

Inspired by another answer in this thread, Kung Fu Hustle. It's also a pretty good Kung Fu movie, similar to how Shawn of the Dead manages to be both a comedy and a pretty good zombie movie.

Clue. One of Tim Curry's finest performances. Madeline Kahn's, too.

Big Trouble in Little China

Nothing but Trouble

What We Do in the Shadows (the movie, not the series). For something more obscure, An Evening with Beverly Luff Linn. Yes, both feature Jemaine Clement

Death to Smoochy is criminally underrated. Robin Williams and Ed Norton are so good in it.

Mystery Men!

Top Secret! (1984), a WW2 parody featuring Val Kilmer. From the same guys who made Airplane!.

If everyone hasn't watched Hot Tub Time Machine, everyone should watch Hot Tub Time Machine.

Is it fair to say that Mel Brooks movies are uncommon now? Have they gotten old enough that people today are generally ignorant of them? If so, "Blazing Saddles", "History of the World: Part 1", "Young Frankenstein", and "Spaceballs" are incredibly worthy of a watch.

Very uncommon. Arguably one of the most disturbing comedy's ever made.

Meet the Feebles is a 1989 musical comedy produced and directed by The Lord of the Rings mastermind Peter Jackson. The film is set behind the scenes at a Muppet Show-like theatrical company, and it nods to The Muppet Movie with its story about raggedy puppet entertainers dreaming of making it big. Except in Meet the Feebles, most of the puppets are diseased, drug-addicted, and / or sexually perverse. Jackson, his partner Fran Walsh, and fellow New Zealand weirdos Danny Mulheron and Stephen Sinclair collaborated on a screenplay that weaves together about half a dozen subplots; the most prominent involves the talented hippopotamus Heidi, whose lover (and the troupe’s impresario) Bletch is cruelly dismissive and adulterous. As the Feebles prepare for the show that could be their big break, their personal problems start to spill over onstage.

https://www.theverge.com/2018/8/24/17778026/happytime-murders-peter-jackson-meet-the-feebles-perverted-puppets-streaming-recommendation

'My cousin Vinny' seems relatively uncommon, and is a beautiful courtroom comedy drama.

Kiss Kiss Bang Bang

Swiss Army Man!

I feel like "The Man Who Knew Too Little" is pretty uncommon even though it's a Bill Murray movie. One of my favourite comedies of all time!

Walk Hard

Hercules returns

Grandma's boy

Fat pizza

Hudson hawk

True lies

The Kentucky fried movie

Kung Pow Enter the Fist

My personal favorite tucker and dale vs evil.

Edit: also Scouts Guide to the Zombie Apocalypse

The Death of Stalin

Four Lions

Black Dynamite

My Cousin Vinny.

Uncle Buck

Freddie Got Fingered is a masterpiece that, when released, was one of the worst rated movies ever.

It’s so incredibly ahead of its time, coming out before all the Adult Swim absurdist stuff that we all know and love.

Bless Tom Green.

Oscar.

https://youtu.be/QbfVZBsgC4s

Directed by John Landis (Animal House, Blues Brothers, Trading Places, Coming to America)

Starring:

Sylvester Stallone
Don Ameche
Tim Curry
Marisa Tomei
Linda Gray
Chazz Palminteri
Kurtwood Smith
Yvonne De Carlo
Martin Ferrero
Harry Shearer
Arleen Sorkin
Kirk Douglas

Also Adam's Apples (Adams æbler) and if you like that also The Green Butchers.

The Intouchables (SIC). The original French film with Omar Sy. Not the pointless Hollywood remake. Its my favourite comedy of all time.

Dead Men Don't Wear Plaid. Early Steve Martin love letter to classic film noir. Everything is played super straight and it just works

Burn After Reading.

I always liked Dr. Strangelove

Drop dead gorgeous Muppet treasure island Muppets from space

Idle Hands.

2000-era disaffected teen horror-comedy. Not shy about the horror elements. Absolutely bombed. Basically a forgotten stoner comedy that you reeeally shouldn't watch high.

Devon Sawa, Seth Green, Elden Henson, Jessica Alba, Vivica Fox.

A Night at The Opera has some of the funniest physical gags I've seen in a movie. It is from 1935, but I found it very entertaining.