Leonardo DiCaprio is convinced he is unsuitable for comedy movies - because he's too drawn to tragic movie parts.

The star has mainly taken on dramatic portrayals in his 18-year career, in films including Oscar-winning Titanic, Romeo + Juliet, and Gangs of New York.He stars in forthcoming Martin Scorsese thriller Shutter Island - and the actor was quick to sign up to the project after reading the dark script.DiCaprio tells Total Film magazine, People say I do tragic characters, but I find them very interesting and more compelling. I'm drawn towards them.I want to be moved during a cinematic experience and this movie changes form in a lot of ways. No-one is going to see this movie and say it's not interesting.