"The Human Centipede" is considered by many to be one of the most disturbing films of the last 20 years.  Its about a doctor whose lifelong dream is to sew people end-to-end to create a human centipede 12 people long.  In the film the doctor succeeds in an early test, joining three people together.  The original film, though graphic and disturbing, met with little resistance from ratings boards.  The British Board of Film Classification gave the films the "18" rating, saying,

"Although the concept of the film was undoubtedly tasteless and disgusting, it was a relatively traditional and conventional horror film and the Board concluded that it was not in breach of our Guidelines at ‘18’."

However, after viewing the current cut of "The Human Centipede II: The Full Sequence", the BBFC has rejected it, effectively banning the film in the UK in theaters as well as home media.  The reason for the the rejection centers around the highly disturbing sexual nature of the plot.

“the sexual arousal of the central character at both the idea and the spectacle of the total degradation, humiliation, mutilation, torture and murder of his naked victims".

"The explicit presentation of the central character’s obsessive sexually violent fantasies is in breach of Classification Guidelines and poses a real, as opposed to a fanciful, risk that harm is likely to be caused to potential viewers."

The sequel, instead of taking off where the original left off, is set in "the real world" where a fan named Martin has become sexually obsessed with the DVD of the original film and decides to complete the entire 12-person full sequence for his own gratification.  The director of the film, Tom Six, wasn't as upset with the UK ban as he was with the BBFC revealing some spoilers (including two sexually and violently graphic scenes containing sandpaper and barbed wire) in their press release explaining the rejection.  "The Human Centipede II: The Full Sequence" will be released in American theaters on October 7th.

Trailer for the original...