Megan Fox eventually learned to "let go" while on camera and let out a shriek, and found the results quite therapeutic.

She said: "I was phobic about screaming on camera, but I had to learn to let go.

"I don't know where the noises came from, but when I released them it was like when you break down and cry after months of bottling it up."

The star admits she really enjoyed shooting the horror comedy film as it was a departure from the parts she usually plays