Dia, Urvashi, Aarti, Sophie at Acid Factory Movie Premiere. Sanjay Gupta’s back and yet again with a Hollywood film rip-off. Taken from Hollywood’s 2006 psychological crime-thriller Unknown, Acid Factory too begins with the protagonists trapped in a chemical factory. Admittedly, the plot arouses interest: you have six people trapped in an acid factory, and here’s the best part—they don’t remember a thing. Suffering from temporary amnesia, all six have forgotten their identities and how they got there. They get their clues from phone calls made by a mob boss (Irrfan Khan) and wonder who among them is their friend or the foe.