Knoxville to unleash Jackass spin-off Bad Grandpa

Johnny Knoxville has finished filming on a 'Jackass' spin-off movie – playing his regular character from the previous films Bad Grandpa.

The film, 'Jackass: Bad Grandpa' has been in the pipeline for a year or so, and will now slip into the release slot left vacant by 'Paranormal Activity 5', which has moved to January 3.

[Knoxville positive about Jackass 4]

The offensive octogenarian will now pollute cinemas on October 25.

It's been developed from the skit featured in the 'Jackass' movies, where Knoxville, director Spike Jonze and other members of the Jackass crew dress up in prosthetics and perform increasingly offensive acts pretty unbecoming of the elderly.

Knoxville plays Irving Zisman, and in past sketches has fouled himself in the street and let his grandson drink whisky and smoke cigarettes and shoplifted, all to the general horror of the unsuspecting public.

[Knoxville: No pranks on Last Stand]

Meanwhile, Knoxville has said that he's positive about turning out a fourth film in the 'Jackass' series, and already has some ideas for it.

"Well, we said we weren't going to do a two or a three, and there's probably more of a chance of a fourth film. We're not planning anything right now, but I always write for it," he said.