Seth Rogen is back - and in cinemas to boot! - with An American Pickle, a high-concept comedy about grief, loss, ancestry, religion and what it would be like if your grandfather met you, a 30-something app developer in New York, after waking up from being pickled in brine for over 100 years. You may need to read that sentence again, I don't blame you. Here, Seth talks about his thinky, introspective movie with his trademark booming laugh never far from his lips, before digging into the tried and true Ali Plumb silly stuff towards the end.