1. Pink Flamingos (1972)
Notoriously filthy movie from the Pope of Trash - John Waters, it is very hard to categorise this film as it seems to exist in its own genre of ultimate bad taste. The tag line for the film is 'An exercise in bad taste' which only barely begins to describe it. Divine, the filthiest 'woman' alive is hiding out in a trailer as Babs Johnson with her mentally deficient mother Edie - who loves eggs and her insane hippie son Cracker. Her friend Cotton is also hanging around too. The envious Marbles are determined to steal her title away from her. They abduct hitchhiking women, forcibly impregnate them and sell the babies to gay and lesbian couples. They also sell heroin to schoolchildren. In a contest to outgross each other, the Marbles discover why Divine is the filthiest woman alive... Of course the most famous bad taste moment (literally) in cinema history has Divine gobble up some dog excrement. For real. But focusing solely on Divine eating dog poop is to the detriment of the other hilariously bad taste moments in the film. This includes: Crackers having sex with a chicken, Cracker's 'singing' anus, cannibalism and more absolutely absurd mayhem which will piss off the PC brigade but provides hearty chuckles for us filth-mongerers. Virtually unrivalled in the canon of gross out, bad taste cinema.