Daniel Radcliffe's new movie has offended, baffled and confused viewers at the Sundance Film Festival.

Premiering at the festival on Sunday, Daniel Kwan and Daniel Scheinart's Swiss Army Man was plagued by mass walk-outs according to reports.

The movie, about a lost man (played by Paul Dano) who befriends a farting corpse (Radcliffe), was in fact inspired by a fart joke according to the filmmakers.

Seems many didn't find it funny or entertaining.

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"Counted at least 30 walkouts within first 30 mins of the unarguable SWISS ARMY MAN before I bailed myself at 40-minute mark. DO NOT SEE IT," said film reporter Jeff Sander.

Confusion was also a popular response.

"SWISS ARMY MAN: Yeah, no idea what to make of this fable about depression, magical realist corpses, and flatulence. #Sundance," said Buzzfeed film critic Alison Willmore.

Taking another left-of-field role possibly to distance himself from his Harry Potter image, Radcliffe jumped at the concept.

"The chance to play a dead guy in this context was too much fun to pass up," he said in an audience Q and A.

Those that were able to stomach the movie said it was quite "endearing" after coming to terms with the vulgarity.

"Enchanting, irritating, juvenile and yet oddly endearing," said Leslie Felperin from the Hollywood Reporter.

Radcliffe will next appear in the sequel to Now You See Me.

- AAP