Courtesy of Warner Bros.

Max von Sydow and Linda Blair appear in 1973’s “The Exorcist.”

Don’t get me wrong. That scene is amazing. (And horrific. And shocking. And gross. And epic.) But there are so many more tidbits to know about the movie. Knowing these little nuggets of information is sure to impress (and maybe disgust) a few people at a party or two. So, after this brief plot synopsis, get out your pens and pencils, take notes and get ready to be praised as a horror guru.

The first thing to remember is this: Don’t worry yourself too much over the plot. An actress goes to Washington, D.C., and notices some disturbing changes in her daughter Regan’s actions and appearance. She calls on the help of two priests to fix her. That’s all you need you know. That’s all anybody knows.

1. The original trailer for “The Exorcist” was banned from many movie theaters on the basis that it was too scary.

2. Mercedes McCambridge, the actress who voiced the demonized Regan achieved the gravelly tone by “chain-smoking and forcing herself to vomit up a mixture of raw eggs and mushed apples,” according to an article in the KoldCast TV blog.

3. Televangelist Billy Graham proclaimed that there was a devil living inside the film’s original reels.

4. The theaters that chose to screen the movie (and many didn’t) distributed barf bags to audience members as they entered the screening room.

5. The film was never officially released to U.K. audiences until 1999. Many theaters banned it, which encouraged the horror-heads of the U.K. to organize bus trips to theaters showing the film.

6. Regan’s bedroom scenes were actually filmed inside a large freezer. William Friedkin, the film’s director, wanted to make the room as cold as it was in the screenplay.

7. Post-production took place at 666 Fifth Ave. in New York City.

8. Allowing adjustments for inflation, “The Exorcist” is the highest grossing R-rated movie in American film history.

9. To attain the gruesome sound of demons leaving a body, Friedkin settled on a sound reel of pigs being herded for slaughter.

10. The then 14-year-old Linda Blair, who played Regan, had lines with such intense profanity that, on the first day of filming, Max von Sydow (Father Merrin) was stunned enough to forget his lines.