Knoxville walks red carpet in Sydney Beer in hard, Johnny Knoxville walked the red carpet for the Australian premiere of his new film. COMPARED to his stunts on Jackass, Johnny Knoxville says his trips to the hospital for Bad Grandpa were nothing. Beer in hand, Knoxville greeted fans at the Australian premiere of Jackass Presents: Bad Grandpa in Sydney on Thursday night. The movie has Knoxville donning prosthetics to play 86-year-old Irving Zisman, who travels across America with his eight-year-old grandson (Jackson Nicoll) - a road trip filled with pranks, stunts and captured with hidden cameras. "I fractured my elbow and had to have surgery on my hand, but other than that it was pretty good," Knoxville says of his resulting injuries. Particularly in comparison to breaking his penis on Jackass. "In comparison to a Jackass film, yeah it was alright," he says. Bad Grandpa also gave Knoxville the freedom to pull stunts on the public again, and perhaps push the boundaries a bit further while playing Irving. "I can prank the public again as an old man and when you're an old man, people think you're harmless and give you a wider berth," Knoxville says. Plus I have this cute little chubby boy next to me, who's an assassin by the way. Some kids when they do stunts, they freeze up and get scared. Jackson you had to back down from people. He would yell at people if they didn't give the desired result. And although it's not Jackass 4, fans seem to be enjoying the more story-driven movie, with Bad Grandpa earning more than $US60 million in the US alone since opening there two weeks ago. "There's all the pranks and stunts of a Jackass film, so I knew our fans would love it," Knoxville says, adding it's in the same spirit as those films. The thing was just figuring out the story and making it work with the pranks and stunts. That was our big concern. Jackass Presents: Bad Grandpa releases in Australian cinemas on November 14