Vacuuming Completely Nude in Paradise (2001)

Viscous, brilliant movie from Danny Boyle (Trainspotting, 28 Days Later). A very British take on the Hollywood "Salesman" movie, where a poor chump gets recruited into the world of high-pressure sales to his own demise.
Poor Pete is a young man with a nasty girl friend, no job, and little future. All he wants to do is be a DJ and mix his own tapes. One day he's accompanying his girl friend to one of her gigs as a stripagram when he meets the head of a vacuum cleaner sales company. He's given a job as a trainee and stuck with Tommy Rag (Timothy Spall) as a mentor.
It's here, early in the film, where Vacuuming deviates from your traditional Death of a Salesman story. Tommy Rag is a totally repulsive human being who has a bad haircut and worse teeth. He belittles poor people in low income housing to buy clunky vacuum cleaners and leaves once he's got their signature. He drives like a maniac and screams "I'll do anything to make a sale!" at the top of his lungs. Poor Pete follows him around in horror.
The supporting characters are something to behold. Retired welfare mothers who dream of doing porn shoots, support staff who are over-worked; it's hard to find a likable person in the entire movie. The one item which links them are their teeth: hideous.
A black comedy that is hard to quit watching.
One warning: the dialogue is mostly in British slang. And there are scenes of sexuality when you'd least expect them.