South Park: Bigger, Longer, and Uncut was originally issued an NC-17 rating.
When they were trying to release their film, South Park: Bigger, Longer, and Uncut the creators got an NC-17 rating from the MPAA. Each time they submitted a new edit of the movie, they added something even more vulgar. The MPAA screened the movie six times, and the studio had to have frequent negotiations to bring the rating down to “R.”