They convinced the stars to “audition” for a “third” Borat film over Zoom, and the video – made in conjunction with Amazon – shows them auditioning for characters, including the ambassador of Kazakhstan.
Walliams especially can be seen going the extra mile with an audition the pranksters branded “world-class”.
At one point, they convince Widdecombe to say Borat's “very nice” catchphrase a total of four times.
The YouTubers went to such extreme lengths to make the project seem legitimate that they wrote an entire script to send to the celebrities' agents.
Each person who auditioned were aware that Borat creator Sacha Baron Cohen hadn’t written it.
“It's sort of hilarious that nobody noticed that these scripts were clearly utterly bonkers,” Manners said.
Pieters told Insider: “We got ourselves into the spirit of Borat and tried our best to write something as true to Borat as possible.”
We tricked David Walliams, Jimmy Carr, Perrie Edwards, Ann Widdecombe and David Spade into auditioning for a fake Borat Movie pic.twitter.com/CnQfBzFHsK
— Josh Pieters (@joshua_pieters) October 26, 2020
The video comes after Borat 2 was released on Amazon Prime Video.
Pieters and Manners made headlines last year after tricking Katie Hopkins into picking up a “completely fake” award in Prague.