The comedian-turned actor played a rock star in Get Him To The Greek and Forgetting Sarah Marshall, and his next movie, Arthur, will see him portray a drunk in a role that was originally made famous by Dudley Moore.
But he said that his decision to take on the comedy role is nothing in the grand scheme of things.
'You know, when you consider the BP oil spill, the gradual ecological devastation of our planet, racism and warm, my being typecast doesn't seem like such an issue,' he told Empire magazine.
Now a reformed drug and alcohol addict, he said that he couldn't draw on much of his experience for his role in Arthur because he was a different kind of drunk.
'Well, Arthur is a merry, twinkly drunk. He's not a tortured, morally ambivalent, street walking, amoral, self harming psychopath. So my own experiences have been of little use,' he said.