Heath Ledger's performance in The Dark Knight quite simply changed the game. He raised the bar not just for actors in superhero films, but young actors everywhere; for me. His performance was dark, anarchic, dizzying, free, and totally, thrillingly, dangerous.

I wish I hadn't worked so hard; I wish I'd had the courage to live a life true to myself, not the life others expected of me; I wish I'd had the courage to express my feelings; I wish I had stayed in touch with my friends; and I wish I had let myself be happier. It's an extraordinary list of getting in your own way, isn't it?

I had huge fun with Chris Evans, as Captain America, because super-soldier though he may be, he's still a man, up against a God who in his own mind is infinitely superior. Then, in the ring with The Hulk, we've got this silver tongued, lightening quick mind up against the embodiment of rage..Loki has this mercurial, transformative ability, not just physically but intellectually, so not all the fights are purely physical. Mind games? Maybe.

If the Loki in 'Thor' was about a spiritual confusion - 'Who am I? How do I belong in this world?' - the Loki in 'Avengers' is, 'I know exactly who I am, and I'm going to make this world belong to me.'

We pull on to the road, where our only company are the wandering cattle, who have become commonplace as traffic lights. Lethargic and listless, they look like they've been roaming the roads of Guinea since the dawn of time. And no doubt they will continue to long after we're gone.

I think everyone should pursue their dreams. Whether you want to play football, act, sing, become a writer or whatever you have burning inside you as you’re growing up, you should pursue it.

I was informed yesterday that there's a Twitter account for my laugh. Very hard to get used to things like that. Pretty amazing.