Dogtooth (18)

The most stylish and entertaining family drama of the week, but also by some way the grimmest.

The children here are grown up but don't know it – they think that you only become an adult when one of your dogteeth falls out, because that's what their parents tell them. And since they live in a house surrounded by tall hedges, and never see the outside world, what their parents tell them is all they know.

Lanthimos follows through the situation – part Josef Fritzl, part philosophical experiment – with appalling logic, assisted by an excellent cast. Whether it adds up to anything, I can't decide; but it's both unbearable and very funny.