Bill Murray never feels offended when he is labeled "difficult" to work with - because he sees it as a "badge of honor." The Hollywood actor famously fell out with director McG while they were making 2000 action film Charlie's Angels, but denied the moviemaker's claims he head-butted him when a disagreement turned violent.

He was also rumored to have clashed with actress Lucy Liu - one of his Charlie's Angels co-stars.

Murray admits he's "nothing but trouble" on film sets, especially when he doesn't agree with the decisions being made - but he doesn't see his refusal to compromise as a failing.

He says, "People say I'm difficult and sometimes that's a badge of honor. At work I'm just nothing but trouble with anything I don't want to do. And I fired my agents. I said I didn't ever want to speak to them ever again, and I never did. It saved me money but mostly it stopped the irritation of the endless phone calls."

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