No movie looks difficult for Brad Pitt, but there's one scheme that the actor and producer discovered as the most complicated - A Mighty Heart.

The 43-year-old actor freshly exposed that he established the 2007 film the extremely complicated development of his life - since it was supported on a factual tale.

Pitt said that he sensed fortunate to be called to direct a film version of Mariane Pearl's book, supported on the kidnapping and murder of her journalist husband Daniel in 2002.

Though, the actor assumed that the most complicated element was to do "justice" to such a tough movie.

"That film is so worth seeing. I think what most people don't understand, even reviewers, is the mines and traps that were avoided and how easily the film could have gone off the rails," Contact Music quoted him, as saying.

"They don't see all the years that go into the final product to make sure it's quality. There was great responsibility with that one. It could have been done so badly," he added.