Donkey Punch (18)

What happens when three young ladies from Leeds meet four public-school boys at a party in sunstruck Mallorca?

Sex and drugs on a borrowed yacht for starters, followed by some narcissistic videocam-wielding that records everything up to the moment idyll turns to peril, and a bedroom prank goes horribly wrong.

Then the film becomes a mad scramble for the metaphorical lifeboat as the blame is frantically tossed back and forth between them. Even the girls turn Darwinist: when their only escape is for one of them to throw their body through a glass door, one friend volunteers the other for the job with the immortal line, "You're heavier than me".

For a while, the director Olly Blackburn steers around the vortex of catastrophe quite ably, but his film is eventually holed by hysterical stabs of Grand Guignol, and a script that doesn't know when to quit.