A "donkey punch," like a “dirty Sanchez,” is one of those sexual acts that most people will never, ever do, nor even actually want to do, but still the kind of thing that makes for good conversation over a couple of beers at a frat party.

That said it's hard to imagine a donkey punch ending well, even in the most perfect of scenarios. But in Olly Blackburn's debut feature that premiered at Sundance, Donkey Punch, the consequences of one harmless little donkey punch quickly spiral out of control.

Three attractive young British women decide to vacation in Spain. After drinking and dancing their way through several clubs, they happen upon a bar with four attractive men eager to make their acquaintance and invite them back to their yacht for an afternoon of dancing, drugs and debauchery. After a particularly jarring sexual scenario, the girls realize that perhaps they can't trust the guys they just met in a nightclub after all. Channeling the "Oh crap! Maybe this will fix this situation. Crap! Now we're even more f*#ked!" subgenre of thriller as with its predecessors Shallow Grave and Very Bad Things/i>, Donkey Punch is one of the most intense and sexiest horror films to come out of the UK in recent years. Be warned, this film might just leave you punch-drunk.