The Exorcist (1973)
The Scene: Possesed girl Regan (Linda Blair) is caught masturbating with a crucifix.
Look Away When: Her head spins around 180 degrees.
BBFC Reaction: 'Banned' - or, technically, never submitted - on home video after the 1984 Video Nasty scare, but a mainstay of late-night cinema screenings. Passed uncut for DVD in 1999.
Salo, or the 120 Days of Sodom (1975)
The Scene: The young prisoners of a clique of fascist sickos are invited to dinner. Today's special, however, is more cordon bleurgh than cordon bleu.
Look Away When: They tuck in to a feast of human faeces.
BBFC Reaction: Banned in 1976, to the extent that a cinema club which screened it was raided by police. Eventually passed with no cuts in 2000.
The Scene: Anna (Morjana Alaoui) is imprisoned and tortured by a secret society that thinks her suffering will provide insight into the afterlife.
Look Away When: She is flayed alive.
BBFC Reaction: Passed uncut for DVD and limited cinema release.
Natural Born Killers (1994)
The Scene: Warden McClusky (Tommy Lee Jones) is attacked by his vengeful prisoners during a riot.
Look Away When: His severed head is displayed on a spike.
BBFC Reaction: Stone had already cut 4 minutes (including this scene) to get an R ratiing in the US. The BBFC passed this version without further cuts, although the Dunblane massacre delayed the VHS release of the film.
Stone's preferred cut, complete with 'head on a spike,' was released in 2001.
Ichi the Killer (2001)
The Scene: A prostitute is tortured by corrupt cops Jiro and Saburo.
Look Away When: A knife is drawn across the table, slicing off her nipples.
BBFC Reaction: Film cut by 3 minutes, 15 seconds, mostly of "scenes of mutilated, raped or savagely beaten women or of sexual pleasure from violence."
The Evil Dead (1982)
The Scene: Holidaymaker Cheryl is chased into the woods by a demon, which proceeds to possess a tree and molest her.
Look Away When: A large branch turns the assault into full-blown rape.
BBFC Reaction: Achieved notoriety as one of the Director of Public Prosecution's 'Video Nasties' and not passed uncut until 2001.
The Scene: Auto-eroticist James Ballard (James Spader) has sex with car-crash victim Gabrielle (Rosanna Arquette).
Look Away When: Ballard's chosen hole: a wound in Gabrielle's thigh.
BBFC Reaction: Passed uncut, but others were less lenient. Westminster Council, for one, refused cinemas permission to play it in the West End after a high-profile campaign against the film by the Daily Mail.
Straw Dogs (1971)
The Scene: While her American hubby is away, Amy (Susan George) is raped... twice, by ex-lover Charlie and then by sadistic yokel Norman.
Look Away When: Amy stops enjoying it (see below).
BBFC Reaction: A notorious one, because Amy appears to enjoy the first assault. However, distributor pre-cuts to the second, more horrific attack compounded the problem, which was why the BBFC refused a video release for that version in 1999. The uncut version was finally passed in 2002.
The Scene: Grieving mother Charlotte Gainsborough decides to take extreme actions with a pair of scissors.
Look Away When: She clips off her clitoris.
BBFC Reaction: Passed uncut. In fact, the poster caused more controversy, with seven people complaining to the Advertising Standards Agency.
Henry: Portrait of a Serial Killer (1986)
The Scene: Serial killer Henry (Michael Rooker) and partner-in-crime Otis invade a home to kill a family.
Look Away When: Otis gropes the family's mother after he's killed her.
BBFC Reaction: Different cuts on three separate occasions, primarily to this scene. Finally passed uncut in 2003.