An innocent bachelorette dare goes horribly and violently out of control in this startling independent Mexican thriller/horror film. It all starts off lightly enough, with Natalia arriving in Mexico from Spain to visit her boyfriend (played by "Y tu mamá también" star, Diego Luna). But things turn darker after she and group of wild female friends out partying meet an unsuspecting cowboy. The giggling girls secretly feed the macho man some Viagra and what began as a prank quickly turns violent.