Sir David Jason has told how he played one final prank on his A Touch Of Frost cast mate John Lyons before the show was brought to a climax.
Sir David, who stars as Detective Inspector Jack Frost, said that during every series for the last 17 years, John, who plays the curmudgeonly copper's sidekick, Detective Sergeant George Toolan, has been the victim of a practical joke.
"At some point, we always get our man," Sir David told the TV Times. "We're absolutely ruthless."
He told the magazine that the first joke played on John involved his character investigating a railway death strewn with body parts. DS Toolan was meant to find a finger concealed beneath a rag - but instead someone had hidden a Cumberland sausage.
Sir David told the magazine: "At the time John leapt in the air, swore at us and vowed we'd never catch him out again - and if we did, he'd pay us £50. Of course, that was a red rag to a bull. Now it's cost him hundreds of pounds!"
Sir David said his final prank saw him pop up like a ghost on a giant screen mounted on top of a van during a serious scene.
Sir David said: "We have you once again, Johnny Lyons. You owe us £50!"
The veteran actor, 70, told the magazine: "The most important thing about the jokes was that, over the years, everyone - the actors, wardrobe, make-up and the camera crew - got involved. It was one of the big things that bonded us like one big, happy family."
The last instalments of the show will air on ITV1 over Easter.