I was tidying up the living room yesterday afternoon – we had a clothing purge, so there were ill-chosen items scattered across the floor and prized garments folded along the back of the sofa… do not ask me about the shoes – and I shoved Iron Man in the DVD player to pass the time. It’s exactly what you’d expect: macho guy, brief origin story, conscience, do-goodery. And yet… it’s nothing like what you’d expect.