It seems obvious that being good at one thing doesn’t necessarily make you good at another. But chuck in all the ego (and financial clout) that goes with being a star, and it’s unsurprising that many successful actors have tried to boost their credibility by turning director. Keeping that in mind, we took the question, “If you could make a documentary about anything, what would it be?”, to some of our favourite A-listers and here’s what they had to say. Read on: