The House of Lies star, who plays the title role in Aussie comedy film Any Questions for Ben?, said that he felt a lot of "pressure" when he was offered the part because he wanted people to find the movie funny.
Lawson told The Age: "[An Australian comedy film that is funny is] a rare thing. Comedy is tough in this country. We have produced some great comedians and continue to do so [but] it's hard to get acting roles that are funny. I worried [about the reception to the film] because I'm proud of it. When you care about something, it becomes infinitely more scary."
He said that he was shocked when Working Dog Productions told him that they had created the character of Ben just for him.
"It was really overwhelming," Lawson admitted. "They pitched this film to me over dinner and at the end I thought I'd love to be a part of it, but they hadn't said that. I never thought that they were pitching it for me as the lead."
When the company told Lawson that they had "written the role" for him, he said that he worried the project would "fall down", because "so much in this industry is promised and falls through".
Lawson said that his character in Any Questions for Ben? was "a challenge", because he is a rogue, but he also wanted to make sure that "he was likeable". He also claimed that he was "really similar" to Ben when he was younger.
Lawson said that despite spending a lot of time in LA, he is still hoping to work more in his home country, adding: "I love working in Australia. I'm happiest when I get to do it."
His real-life girlfriend Rachael Taylor, who he met while filming Any Questions for Ben?, recently said that she will always remain devoted to making Australian movies.
> Josh Lawson 'would love to work with girlfriend Rachael Taylor again'
> Daniel Henshall: 'Any Questions for Ben?' was relief after 'Snowtown'
Watch the trailer for Any Questions for Ben? below: