It's easy to sit in front of a computer screen and hammer a film on one viewing without ever thinking about the thousands of hours of hard work and sacrifices that have been made to bring it to the big screen.

Jared Leto

Jared Leto

'Suicide Squad' has had a mixed response so far, but has anyone stopped to consider what the cast went through? Especially when Jared Leto took on unusual approach to method acting to realise his interpretation of The Joker.

The 44-year-old actor took his casting of the green-haired supervillain very seriously and stayed in character all the time, sending his castmates a variety of weird gifts, including a dead pig, a live rat, used condoms, bullets and sex toys.

Recalling some of the odd presents, Will Smith - who plays Deadshot - said: "Jared was really the first person that like really kicked it into another gear. So we were rehearsing. He was working separate, so The Joker was working separate. So one day there's a knock on the door, and this guy walks in, this tough looking guy walks in, he says, 'I've got a message from Mr. J.' He puts a box down on the table in front of Margot. He says, 'That's a gift from Mr. J, in honour of your relationship.' I was like, 'Oh Mr. J, OK, OK.' So Margot starts to open the box, and there was a note [and a live rat], and it was from 'The Joker' ... So for the whole movie, that's the kind of stuff Jared was doing. He really kicked everybody into another level."

Jared hopes his commitment to the role will mean he gets to reprise the character in the future and his dream is to take on Ben Affleck's Batman in a standalone film.

"I hope it's an introduction [of The Joker] ... and not the end! Because I could easily just play The Joker a couple more times and then retire. Because it's so fulfilling and so creative and it's so imaginative. It's really difficult to think about doing anything else!

"I think it would be incredible to see Batman and the Joker go head-to-head! This Batman and this Joker. I mean, I don't know, that might be too much! But that would be fun," he said.