The 50-year-old, who plays Amanda Waller in the much-anticipated DC Comics antihero movie alongside Will Smith, Margot Robbie and Jared, was left quite disturbed by the present she received from her co-star's character The Joker.

The Oscar-winner infamously stayed in character as the evil villain throughout filming, and sent his castmates disturbing gifts such as used condoms, a dead pig, anal beads, rats and pornographic magazines - and Viola wasn't left out of the creepy fun.

"It was a little worrisome,” the star told E! News of the box of bullets she received from the Oscar winner. “It made me a little bit nervous and I’m pretty tough. You know I got into a few fights when I was growing up... but it scared me a little.”

Viola didn't get to meet the 44-year-old actor properly until the film's wrap party, but she admits she was still a little wary of Jared.

"Before that I was only introduced to The Joker... and I almost had my pepper spray out," she laughed. "You know, ‘You remember that bullet you sent me?'"

Viola enjoyed working on the film, and loved the fact she was given freedom to develop her character.

"Every single person in it (film) gets to be completely insane because all the characters are insane,” she added. “They’re bad guys. We’re all bad guys.”

However, things got so intense, Viola worried she wouldn't make it through production at one point.

"Just put it this way, it got so crazy that there were times during filming that I had heart palpitations," she previously told the outlet. "Not only heart palpitations, but at one point I said, 'Did I suffer from hearing loss? Why is my left ear still pounding?'"