The actress said she was cautious about tackling the iconic shower scene in the horror film, reported Contactmusic.
"At first I didn't really think about it, but as the day of the shower scene came closer, I started to worry.I kept watching that scene from 'Psycho' over and over and I have to say that it was very hard to get in the part of an actress who plays the part of a real star," Johansson said.
The movie is directed by Sacha Gervasi and it depicts the marital issues between Alfred Hitchcock and his wife Alma while making the 1960 horror classic.