1) Ilsa: She Wolf of the SS (1975) - Directed by Don Edmonds.
The hands down king (or should I say Königin) of the Nazi Exploitation genre due to the scenary chewing (though charismatic) acting of lead actress, Dyanne Thorne. Other that it's the usual uniformed affair - graphic torture, nudity and dodgy accents but the whole thing is so over the top it's hard to find it really that offensive (well almost). Some trivia, this movie was filmed on the sets of dire American comedy, 'Hogan's Heroes'.
2) Salo: 120 Days of Sodom (1975) - Directed by Pier Paolo Pasolin.
Based loosely on the light romantic novel by the Marque de Sade. A group of fascists towards the end of World War 2 take refuse in a castle bringing with them a selection of teenage boys and girls to amuse their sadistic appetites. You know when a film has a chapter called 'Circle of Shit', that it's not going to be fun for anyone.
3) Slaughtered Vomit Dolls (2006) - Directed by Lucifer Valentine.
Mindless, stream of consciousness spewed (literally) from the brain of a strung out crack whore. Hard to watch for all the wrong reasons but this didn't stop director, Lucifer Valentine, making this part of a vomit filled trilogy.
4) Pink Flamingos (1972) - Directed by John Waters.
Early John Waters film, featuring 350lbs transvestite, Divine, going on a quest to become "The Filthiest Person Alive". And before you ask, the dog shit scene was done for real.
5) Flowers of Flesh & Blood (1985) - Directed by Hideshi Hino.
Part of the infamous Guinea Pig series. No plot as such just as such just some demented Samurai cutting up a body for 50 or minutes. This film first probably came to most peoples attention with the story of pre-Tiger Blood, Charlie Sheen, informing the FBI that this was a real life 'snuff movie'.
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