Aaron Johnson knows that it isn't easy to fool Matthew Vaughn, who is set to direct Mark Millar's Kick-Ass. Still, the actor recently told London's Daily Mail that he managed to do just that when he auditioned for the lead role of Dave Lizewski, an American boy who wants to become a superhero.

Although Vaughn instructed the casting director not to audition British actors for the role, Johnson managed to secure just such an audition. "I was working in the U.S. anyway and did a screen test using an American accent and he didn't realise I was British. I kind of fooled him," Johnson said. Vaughn backed up the story "I fell off my chair when I was told. His American accent is pitch perfect and he can bloody well act."

Johnson also discussed a bit about the character. "Dave (Lizewski) is just an ordinary guy; he's not geeky, but he's not cool either. He gets his kicks dressing up in a makeshift super-hero outfit complete with Timberland boots. He goes out to try and find some crime to prevent and ends up getting the hell kicked out of him because, obviously, he's not a real super-hero. That's the thing about Kick-Ass," Johnson explained. 'It's set in the real world and poor old Dave ends up in hospital.'

Kick-Ass follows the story of a 15-year-old boy named Dave Lizewski who, despite living in the "real world", decides to become a superhero. The film was co-written and is being directed by Matthew Vaughn. Already signed to the cast are Aaron Johnson, Lyndsy Fonseca, Chloe Moretz, Christopher Mintz-Plasse and Nicolas Cage.