Matt Damon was stunned when he realised how dark the BROTHERS GRIMM fairytales really were, and can't believe he wasn't terrified as a child.

The actor - who stars alongside Heath Ledger as the famous brothers in Terry Gilliam's new movie - was reminded of the subject matter when his mother dug out his old copy of the Grimm tales.

He says, "While we were making the movie my mother actually showed up on set with my little hardcover Grimm's fairytales.

"Looking back, the stories are a lot more macabre than I remember. And there's some pretty racy stuff too."