Have you ever seen a sofa you like in a shop window and really wanted it? Wanted it so much you can't stop thinking about it? Wanted it so much you feel physically sick? Wanted it so much that nothing else in your life matters and you would do anything, literally anything to get it, no matter the cost?

Of course you have, we all have. And at long last, someone has made a comedy film about really really wanting a sofa.

We could tell you the sofa is a metaphor for something – happiness maybe, or equality perhaps. But it isn't. It's just a really nice sofa.