Jake Gyllenhaal loves comedy.

The 'Prince of Persia: The Sands of Time' actor insists he wants to make more movies that do not take themselves seriously, because it is such a challenging genre to get right.

He said: "Comedy is really what I enjoy the most. And it's what I find hardest. Earnest is f**king easy.

"Finding the comedy in a situation is always the hardest thing, and I think as an actor you should always try and find the hardest thing."

Despite claiming to find comedy difficult, Jake had no difficulty getting laughs with his 'Prince of Persia: The Sands of Time' co-star Gemma Arterton, which she claims is because they forged such a good friendship off camera.

She explained: "We have this kind of banter anyway, as Jake and Gemma. So that kind of transfers to the characters. There's a lot of witty remarks, cutting each other down."