In the results show for tonight’s Britain’s Got Talent live semi-final, Dec walked over to the judging panel to announce that the voting had closed.
But as he did, David could be seen throwing confetti at the presenter and appeared to be far from impressed.
Dec turned to the judge and jokingly warned him: “Stop it, stop it.
“I’m going to smash your face it.
“I’ve been calm all week but you’re really getting on my pip.”
He then turned to the camera and told viewers at home: “I think we should go to a commercial break.
“While the votes are counted and verified, I’m going to take David over my knee and let’s see what happens.”
David was more than happy to oblige as he stood up and leaned over the judge’s desk.
Dec then proceeded to spank David which had the audience in hysterics.
The exchange was of course all in jest and came after viewers spotted a hilarious blunder during Mandy Muden’s magic act.
ITVBritain's Got Talent: Dec Donnelly lashed out at