It’s Johnny Knoxville.

We’re not talking about Hollywood, or Manhattan, Atlanta, or even New York.

It’s Knoxville.

Pure unabashed Johnny Knoxville.

Bad Grandpa is a derivative of an hilarious short from Knoxville’s popular Jackass movies. With the help of prosthetics, polyester, and a pair of ugly brown orthotics, Knoxville parades as a geriatric forced into taking his grandson on a cross country adventure. Stops include a male strip club, a bingo parlor, a beauty pageant, and a biker bar.

Think Harry and Tonto meets Candid Camera kicks the crap out of Pee Wee’s Big Adventure spills its drink all over Grumpy Old Men.

The movie works with a loose script, hidden cameras, and unwitting participants caught in the middle of Knoxville’s twisted fantasy. The juxtaposition of his inappropriate antics against the befuddled reactions of the unsuspecting interlopers can make you ache with laughter.

Remember, this is Knoxville. Bad Grandpa is not for those who lean toward the prudish. Avert your eyes as gramps enters the male strip club or have a front row seat to the age of sagging. I wish I could tell you more, but decorum does not allow it. A contest inside of a restaurant ends with a lot of lost appetites.

The role of the grandson was played well by 10-year-old Jackson Nicoll. The adult humor coming from his pudgy little cheeks is entertaining as opposed to over-the-top. His performance is reminiscent of the young actors in 1976’s Bad News Bears; it’s adorable in a potty-mouthed kind of way.

Okay, full confession. I’m a Johnny Knoxville fan. At least, I’m a Jackass fan. I laugh at the sight of an old man launched through a store window by a malfunctioning kiddie ride. I also laugh at errant bodily functions. Forgive me. My sense of humor runs toward the juvenile.

I guess it runs closer to Knoxville than it does to Hollywood.