This was one gig he couldn’t Sher-lock down.

Robert Downey Jr. revealed to Howard Stern that fellow Oscar winner Kate Winslet couldn’t hold back her contempt over his attempt to pass for an Englishman during a unique joint audition for Nancy Meyers’ “The Holiday,” back in 2006, with Winslet, Cameron Diaz, and “Tonight Show” host Jimmy Fallon.

“[Jimmy and I] both got called in just as seat-fillers,” the “Oppenheimer” and “Iron Man” actor recalled. “Jack Black is getting his part and Jude Law is definitely getting my part, but [Meyers] needed someone to read with the gals, and we’re sitting there going, ‘It’s about to happen for us.’”

“I was like, I’ve got to have a better English accent than Jude Law at this point, and Winslet said, ‘That is the worst British accent I’ve ever heard in my life,'” Downey Jr. confessed.

“I was like, I’ll check out now, but I’m taking the gummy bears from the minibar.’”

Fallon, who was also present for the Stern interview, confessed to being so pumped to be in a hotel room reading the script he admitted he would’ve done the movie at the time “for half [the] price” if Jack Black backed out.

The director let the pair down together, saying they weren’t “a perfect fit,” he added. Fallon joked about never auditioning for another role because of the embarrassing audition.

“Without a doubt, I’m sitting across from Robert Downey Jr., and I go, ‘This is the best actor I’ve sat across [from] and did a scene with in my entire life,'” he recalled. “It was mind-blowing for me, and I quit the business. I never went back.”

The 2006 romantic comedy would eventually star Jack Black and Jude Law as the love interests to Winslet and Diaz, respectively.

Fallon joked that he got a tattoo of him and Downey Jr. — “us arm in arm, leaving dejected not being cast in this movie.”

“That movie would have been so much better with the two of you guys,” Stern said.