Actor Nawazuddin Siddiqui left his home for two days without informing anyone, and then started fearing himself while he was preparing for his role in the film 'Raman Raghav 2.0', where he plays a psychopathic serial killer.

Watch: 'Raman Raghav 2.0' trailer out! Nawazuddin Siddiqui is 'God's CCTV camera'