If he wanted, Simon Cowell could keep things pretty simple when judging Britain's Got Talent: a red buzzer means it's all gone pretty badly for an act, while a simple 'yes' gives them his backing for a spot in the next round.

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Yet, while Cowell may be known for being the ice-cool 'Mr Nasty', there's plenty to be gleaned from his various facial expressions. From a simple eyebrow raise to a wink, we decode just what these reactions mean and whether the acts should be running for the hills or jumping for joy...

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Britain's Got Talent returns Saturday at 8:00pm on ITV

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