Leonardo Dicaprio finds dark films "exciting".

The award-winning actor - who recently made his sci-fi debut in British director Christopher Nolan's blockbuster 'Inception' - admits he gets bored if he feels his characters act in a very straightforward manner.

He told Britain's The Independent newspaper: "I find these types of films that are psychologically sort of dark at times extremely exciting to do because there's always something to think about.

"There's nothing more boring than showing up on set, saying a line and knowing that your character means exactly what they say."

The 'Aviator' star - who shot to fame in 1997 when he starred alongside British actress Kate Winslet in 'Titanic' - revealed 'Inception' was so deep that when he initially read The Script, he didn't understand it.

He said: "I didn't understand the script at first. Films should make you extract your own meaning or have different interpretations of an ending. Some things will always be uncertain. And isn't all this part of the experience of going to see a film?

"When it's done properly and you don't lose the audience, I think they are completely engaged and happy to unlock some of the answers.

"If I go to a film and there's no discussion after, that makes me think it's pretty sh**ty."

'Inception' is released worldwide throughout July.