It's been scientifically proven that if you don't find at least one thing in Ghostbusters funny, you don't exist.

What, Ghostbusters isn't scary enough for you?

Back off, man.

- Originally called "Ghostsmashers".

- The movie was inspired by Dan Aykroyd's interest in the paranormal. He always intended the movie to star himself with John Belushi, Eddie Murphy, and John Candy, but the former passed away before production began and the latter two were uninterested.

- Bill Murray only agreed to star in the movie if Columbia green-lit a remake of Razor's Edge.

- Every scene had at least one moment of ad-lib, with most of Bill Murray's lines improvised on the set.

- Director Ivan Reitman voiced both Zuul and Slimer.

- Paul Reubens turned down the role of Gozer at the end of the movie.

- The ghost floating above Ray in his dream is Dan Aykroyd's wife.

- The original librarian ghost puppet was deemed too scary, so it was shelved and used in Fright Night a year later.

- The proton packs are never actually called that in the original movie.

- The top portion of Spook Central does not exist in real life. The building used for the movie, located at 55 Central Park West in Manhattan, is a fraction of that size, so its height was significantly beefed up with matte paintings and models. And yes, there is a church next to it, which to my knowledge has not been stepped on.

- Slimer was referred to as "Onion-Head" by the crew because of how bad the puppet smelled. In Dan Aykroyd's head canon, it's the ghost of John Belushi.

Word to the wise: never, under any circumstances, type "he slimed me" into Google Images. I've seen shit that would turn you white.

- William Atherton has said that playing Walter Peck has ruined his life. Now no matter where he goes, people will confront him about his actions within the movie, and it's actually gotten him a couple physical fights. It's tragic, really, especially when you consider that Peck actually had some fair points regarding the Ghostbusters' practices. If only he wasn't such a dickless wonder.

- Speaking of which, the molten marshmallow goop that engulfs Peck in the finale is a crap-ton of shaving cream.

- The no sign in the iconic logo is backwards.

- Bill Murray's proton pack was loaded down with 40 extra lbs by his cast members without his knowledge, mostly because he was funnier when he was agitated.

- The Keymaster is locked out of his apartment three separate times.

- The movie's release date was so tight that several effects shots weren't even finished by the time production was wrapped.

- Three weeks at #1 on the chart, baby.

Wait, are you sure that's how it goes?

- This is literally the greatest movie scene of all time.

We've been going about this all wrong. This Mr. Stay Puft is okay, he's a sailor, he's in New York. We get this guy laid, we won't have any trouble!