This shark-attack thriller will always stay with me for one unprecedented event at the press screening I attended. The drama reaches its climax with an outrageous trick ending, and when the twist revealed itself, someone behind me shouted – and I mean literally shouted – two words, of which the second was “OFF”. I admired the clarity and force of his response, but on his reflection it was a little harsh about an unpretentious film whose destiny it is to toil in the shadow of Steven Spielberg’s Jaws.

Anyway: Mandy Moore and Claire Holt play Lisa and Kate, two super-hot sisters in bikinis who have gone on holiday to help Lisa get over a bad breakup. They are in Mexico, and have a go at lowering themselves in a cage to get up close and personal with sharks. (Mexico is cheerfully portrayed as a dodgy place where safety precautions are neither here nor there.) Needless to say, things go wrong. They are always keening and whining at each other: “Ohmygod, we’re running out of air … stay with me, Kate … stay with me Lisa … ohmygod we’re running out of air.”

You might feel the same way.