Y TU MAMA TAMBIEN star Gael Garcia Bernal makes his feature directorial debut with this study of the class system in Mexico centred on a rowdy house party Cristobal (Garcia Bernal) is a privileged rich boy who loves a good party almost as much as he loves hip-hip Cristobal has made plans for a barbecue at his parents' weekend home but his younger sister (Camila Sodi) & her friends will be staying at the house that weekend as well Cristobal's sister's friends are more hippie than hip-hop & as the party begins to get underway it's obvious that these two groups are incapable of seeing past their differences Likewise gardener Adssn (Tenoch Huerta Mejfa) has known Cristobal since the two were just children yet despite being the same age the two old friends have now been drawn into the same system of class consciousness that divides the entire country While Cristobal has also invited his girlfriend Mafer (Ana Serradilla) to the highly anticipated shindig a chance meeting with Argentine beauty Dolores (Luz Cipriota) prompts the deceitful lothario to purposefully give Mafer bad directions in order to get better acquainted with the lovely new object of his affections