Iron Sky. Nazi's left earth at the end of WW2 and made a base one the darkside of the moon. Sequel has dinosaurs...

The Room.

I don't know if there is anything to discuss there.

Johnny mnemonic is a camp masterpiece

I really loved "My Name is Bruce". That's the thing that popped up in my mind.

The Core

Cannibal: The Musical.

It's a reeeally early Trey Parker and Matt Stone creation. A live action comedy musical movie about the Donner party. Definitely a classic.

Better Off Dead.

An early John Cusack film by Savage Steve Holland co-creator of Eek! The Cat. How many montages can you fit in one movie?

Pacific Rim

Makes no sense in ANY way but boy is it fun to watch. Some YouTube thingy called it the worst best and best worst movie ever, so...

Crank with Jason Statham. Ridiculous but fun.

Troll 2. So many quotable lines and unforgettable scenes. And you don't even have to watch Troll 1, because there is no Troll 1 - at least not in relation to, or in the context of, this film.

Does Velocipastor count ?

Armageddon is something I watch far too often. It's not good but it's very entertaining.

Idiocracy was a great movie when it was satire, alas it's now at best a documentary (at worst a 'what could have been if things were good' movie) Reality caught up and beat it, alas.

Tiptoes

Samurai Cop

Moonfall
So bad its really fun to watch.

I'd nominate Birdemic. You have to be in a mood to laugh at how bad it is.

In a very different way to most of the answers on here so far:

A Pigeon Sat on a Branch Reflecting on Existence.

It's simultaneously excruciatingly dull and mindbendingly interesting. A genuinely fascinating film, but requires a huge amount of focus and commitment from the viewer. Possibly my favourite film ever

Birdemic. Hands down. https://m.imdb.com/title/tt1316037/

Howard the Duck.

Good. God. It. Is. Awful.

It's a crime no one has mentioned Neil Breen yet. I just came back from a showing of his latest film at an indie cinema. The whole place was so roudy and screaming at the film. I've never lost my voice watching a movie before 10/10.

The Love Guru

Everyone I know hates it, but I am a big Mike Myers fan.

Dracula 3000 was a fucking masterpiece

house 2, worst horror movie ever, do recommend

The Room

Cannibal women in the avacado jungle of death. Rowdy Roddy Piper, hot chicks and Bill Mayher.

Without a doubt, for me it's Re-animator. This movie also introduced me to HP Lovecraft.

King Pow : Enter the Fist.

Slipstream (1989).. check it out if you haven't seen it. Mark Hamill, Bill Paxton and produced by Gary Kurtz (Star Wars, ESB, American Graffiti, The Dark Crystal).. This was released 5 years after Return of the Jedi with that star power and didn't even get a US cinema release.

Kung Pow is way more enjoyable than it has any right to be.

The Gingerdead Man https://m.imdb.com/title/tt0364376/

The happening really holds up as one of the greatest bad movies.

Anything directed by Uwe Boll but especially Bloodrayne. It was so bad the actors stopped recording the commentary to get up and go get more wine to finish.

The award has to go to big trouble in little china it's incredible!

Transformers: Dark of the Moon, I love this movie for some reason. I actually enjoy Shia in this role, the action/ special effects are great, and the score from Steve Jablonsky is one of the best I've heard in a blockbuster (yeah I said it). Great voice acting as well with Leanord Nimoy joining in. It also felt like a true ending to a trilogy.