Funnyman Bill Murray was so annoyed when a chatty crew member kept interrupting a crucial scene in his new film Broken Flowers, he threatened him with a knife.

Murray's co-star Pell James recalls the actor halting his flower shop scene with her and dashing off to confront the annoying chatterbox.

She says, "Bill Murray and I are doing the scene, and he's like, 'All right. Excuse me one moment.' And he grabs this switchblade on the counter.

"I'm thinking, 'Oh s**t, he's improv-ing (sic)...' Then he runs out the door, up the street, and then we hear him say, 'If you don't shut the f**k up, I'm gonna knife you.'

"Apparently some PA was gabbing away on his walkie-talkie.

"Then Bill comes back in, casually puts down the knife, and says, 'Where are those flowers?'"