In a twist to this year’s show, all of the judges as well as presenters Ant and Dec have been given a Golden Buzzer to give one act a pass striagh through to the live shows, even if everyone else disagrees.
The BGT judge said he loved to support underdogs and unusual acts, so he had no regrets about his controversial choice.
David said: “I always like to champion the underdog so the person I chose was someone who the other three judges all actually buzzed. I loved him and I think the public are going to love him too, but I wouldn’t put money on him winning.
“Before I joined the show the reason that I loved it as a viewer was I loved all the eccentric characters, so I love to champion those acts, because if it’s all too straight and there are too many singers it might as well be The X Factor.
“I love the idea that you can come on this show and do anything, and for me the weirder the better.”
However, his fellow judges didn’t have such good things to say about the mystery act. Simon Cowell described it as ‘a complete joke’.
Alesha Dixon added: “It’s just mad, and I don’t really understand it. I think he will come to regret it.”
But David claimed that the others had chosen ‘quite conservative’ acts who they already knew would do well.
The new series of Britain’s Got Talent begins on ITV on April 12.