Three signs you’re watching a Shane Black movie: it’s Christmas, there’s a meta voiceover, and some of the best lines are dispensed by designer-suited henchmen. Pleasingly, Iron Man 3 ticks every box. Just as Joss Whedon pepped up Avengers Assemble with his unique brand of jocosity, here, despite the sci-fi trimmings and goliath budget, it feels like Black’s been given carte blanche by Marvel to do his thing. The result is a swinging caper with wit, balls, heart and exploding baubles. It’s Kiss Kiss Bang Bang with a lot of extra bang. And, by some distance, the Man In The Can’s best solo outing so far.