Galaxy Quest

Hot Fuzz is what I came here to suggest - it's the best ACWATNOBI (A Cop With A Theory No One Believes In) spoof/film ever.

I also think Cabin in the Woods did a great job balancing spoof (or at least meta) with actual horror.

Everybody is talking about movies so here's some books: Discworld by Terry Pratchett started as a parody of the fantasy genre but evolves into one of the richest fantasy worlds you'll even have the pleasure to read.

Scream was incredibly meta. It references plenty of slasher films and even has one character talking about the rules of slasher films.

While it's not exactly a parody, it does poke fun at its own genre a lot.

This is such a quality question. But a lot of people are just naming their favorite movies in the comments.

What you want is Moore's Watchmen. It is a deconstruction and reconstruction of the Superhero as an American trope.

What I loved about HBO's continuation is that they focused on how white supremacy is intertwined with heroism, just as Moore wrote in his original IP.

Then you got the Zack Snyder movie which was mostly, "ooh, look at these people with powers fight crime". None of the impending doom of the fall of society from nuclear war and/or fascism, and how the heroes were pointless because they were the ones pushing forward this doom. "Who watches the Watchmen?" etc.

Cool supplementary article: https://nationalpost.com/entertainment/books/watchmen-creator-alan-moore-says-superhero-genre-remains-a-white-supremacist-dream-of-the-master-race

Starship Troopers

DO YOU APES WANNA LIVE FOREVER!?

Tucker and Dale Vs Evil. Starts fine and eventually becomes a horror. It's great.

Glee. It started out as a parody of musicals and high school dramas in Season 1. Then went on to be a musical high school drama for the rest of the show.

The Simpsons started out as a parody of sitcoms and has since become the longest running sitcom.

The 1960s Batman was a campy satire of comics and itself influenced comic adaptations for decades after.

This Is Spinal Tap.

Get Smart

A bit older than the Orville, Red Dwarf was the original satire of Star Trek turned into a legitimate Sci-Fi show a la Star Trek.

I enjoyed it a lot, at least the original seasons. Never watched the later ones they added thirty or so years later.

The Orville. Homage more than parody I'd say.

Not Another Teen Movie

Heathers. it was made to parody adolecent movies and its considered the mother of all adolecent movies (like, the mother of netflix-like movies.)

JFC in this thread: People who don't know what a parody is.

Walk Hard The Dewey Cox Story

After many seasons, it turned out that Joss Whedon was secretly the Big Bad.

Genre satire is different than political satire in that most people who make it often do so out of love for the genre not hated. In fact these works of media aren't nearly as funny if you aren't familiar with the tropes and story beats within a genre, so the audience also ends up being fans. The people who watch slasher parodies are the same people who enjoy slashers.

I like Dead Men Don't Wear Plaid, a farcical noir film that is like a quilt made from the footage of a bunch of other films with original fabric connecting the pieces.

The Incredibles

One Punch Man

The Venture Bros is the only superhero adjacent anything I give a shit about. Greatest adult animation show ever. Making fun of comic books and old Hannah Barbara cartoons but better and more rich and consistent than any of them.