'Unpredictability' is the highlight of Britain's Got Talent 2012, says Simon Cowell

Simon Cowell has teased the new series of Britain's Got Talent, describing 'unpredictability' as the best thing about the auditions stage.

Speaking ahead of the show's return at the weekend, the 52-year-old music mogul - who's back on its judging panel full-time this year - said he loves it when an act comes on and takes him by surprise.

He commented: "I always think I’m never going to be surprised but then a few times this year just when I’m thinking ‘this is not going well’, somebody or some people come on and just blow you away and that’s happened a few times.

"That’s what I love about these auditions, somebody being good when you just don’t see it coming."

Cowell added that he and fellow judges Amanda Holden, David Walliams and Alesha Dixon do their best to ensure that they get a worthy victor.

"You want the winners to go on and have careers, not just pick up a cash prize," he said. "We’ve got to be careful about who we put through to the finals.

"We don’t want somebody winning just because they’ve got a sob story. You want a really, really talented person to be winning the show.

"But I’m still going to put a bet on a dancing dog being there until the end!"

The sixth series of Britain's Got Talent launches on Saturday at 8pm on ITV1

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