Actor Colin Firth and co-star Emma Thompson didn't have the easiest time getting along with their furry co-stars while filming family movie NANNY MCPHEE.

The pair realised the saying 'never work with children or animals' was actually ringing true as they struggled to cope with one stubborn donkey.

Firth recalls, "I remember Emma Thompson, at one point, saying, 'You know, I think I would like to harm this donkey.'

"I would then like to have something written in the end credits that says, 'The donkey was harmed during the making of this film - by Emma Thompson.'"