So apparently there is a famous scene in a spider pit that was cut from 1933's "King Kong," in which a giant spider and other giant creatures eat some sailors alive.
If you scroll down in this Retrocrush story, you can see a photo from the deleted scene, which for many years people didn't believe existed, until Forrest J. Ackerman of Famous Monsters of Filmland (a classic magazine which is reportedly coming back) dug it up.
Saieth Wikipedia: "The spider-pit scene provoked some viewers to scream, leave the theatre and even faint. ... According to "King Kong Cometh" by Paul A. Wood, the scene did not get past censors and audiences only claim to have seen the sequence. Other sources say it was cut much earlier because Cooper believed it would shock audiences so much they would not be able to continue watching the film. ... Stills from the scene exist, but the footage itself remains lost to this day."
This "King Kong" site has even more.