It wasn’t ready for primetime.

“Curb Your Enthusiasm” star JB Smoove, who also used to write on “Saturday Night Live,” has revealed some of his failed sketch ideas, which included a bizarre pitch for Johnny Knoxville.

During a recent appearance on the podcast “Let’s Talk Off Camera with Kelly Ripa,” Smoove said that if he ever hosts “SNL,” he wants to do a “musical monologue” of his failed pitches, including one particular sketch that he called “urine detective.”

 “I wrote that for Johnny Knoxville, when he was gonna be the host. You know Johnny Knoxville? He’ll do crazy crazy s – – t,” Smoove said about the “Jackass” star, who hosted “SNL” in May of 2005. 

Smoove added, “I wrote he was a detective, and he would solve crimes based on your urine sample. So he would taste your urine sample and say ‘Oh, no. This man this man didn’t do this murder, but he did a lot of other s – – t.'”

Knoxville, 53, has since calmed down on his “crazy” stunts. In September, during an appearance on the “Inside of You” podcast, Knoxville said, “After the last concussion on ‘Jackass Forever,’ which really gave me problems for 6 months, I can imagine how it scared my kids.”

Knoxville has three kids — daughter Madison, 28, who he had with his first wife, Melanie Lynn Clapp, and son Rocko, 14, and daughter Arlo, 12, with his second wife, Naomi Nelson, whom he divorced earlier this year. 

Knoxville said that after he got a “traumatic brain injury with a concussion, brain hemorrhage and I broke my wrist and ribs,” he told his kids, “‘Look, Dad’s not gonna do that anymore.'” 

Smoove was a writer on “SNL” from 2003 to 2006 after losing out on a role in the cast.

“So I did make it to the final three,” Smoove explained about his audition.

“It was myself, Finesse Mitchell, and Kenan Thompson. We were the last three. We did our NBC test, everything,” Smoove recalled. 

Mitchell and Thompson were both selected. Mitchell left “SNL” after three seasons, and Thompson is still on the show as the longest-running cast member, having been on it for 22 seasons. 

Smoove did appear on camera in several uncredited roles during his time on “SNL.”

“Everybody’d just wait for JB to pitch the craziest things in the world,” Smoove said, “and I would really play to the audience of these writers in the room.”