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It's been reported over the past year that Jared Leto really, really got into character when he played The Joker for the upcoming movie "Suicide Squad." Viola Davis can now vouch for that.

She thought he was "crazy" with one of his antics.

The Emmy winning actress plays the sinister Amanda Waller in the movie, but her actions were child's play compared to Jared's.

"The Joker, he did some bad things," she told Vanity Fair of her costar. "He had a henchman who would come into the rehearsal room and the henchman came in with a dead pig and plopped it on the table and then walked out, and that was our introduction into Jared Leto."

She said he would send all kinds of "horrific gifts" to her and her co-stars, and that included live and dead animals.

"Now I'm terrified, just as a person, thinking, 'Is he crazy?'" she said, "but the second part was, 'Oh, s—t! I've got to have my stuff together … talk about commitment!"

One of the most savage and disturbing "gifts" was saved for Margot Robbie, who played Harley Quinn. Jared sent her a package of a black rat.

"It was still alive in a box," Viola said. "She screamed and then she kept it."

It was reported that last year Jared sent a box of bullets and a dead hog to Will Smith, along with the video of himself in character as The Joker.

Scott Eastwood revealed last year that he didn't want to approach the actor during production, because he didn't want to "mess" with his method acting style.

"I was sort of afraid to approach him because I didn't want to mess with his thing going on," he told E! News. "But I knew him before. I met him before he was The Joker. I just met him as Jared Leto. So I didn't know if I wanted to mess up his thing."

Margot Robbie, despite the rat, said she actually got used to seeing Jared as The Joker. It was when he was without makeup that she was scared.

She told the Daily News last year, "At first it was kind of confronting (to be up close) but now I'm so used to it, I think if I ever saw him out of makeup now I would be really confused.

"Actually, I saw him out of makeup once and I was actually petrified of him. I was too scared to go up and didn't know who that person was, and when he got back into his makeup I was far more comfortable."