The rest of the film deals with a classic, noirish set-up of an increasingly desperate web of lies and scams to try to stay out of trouble that will inevitably destroy both brothers, Andy’s wife (Marisa Tomei, seldom looking so scorching hot) and their father (Albert Finney).

But here’s the most interesting thing about the movie; there’s hardly a word of swearing (in fact, Bettie scolds a colleague for the language in a bawdy song), no blood, no violence, hardly even a raised voice, yet the film’s rated MA. Have we really come so far in 50 years?

H G Wells’ seminal vision of time travel has influenced the entire science fiction genre. It’s also given us the common cultural folklore we all know about the paradoxes and intricacies of time travel — whether it’s a chair with a giant fan on the back, Skynet or a souped up DeLorean.