Britain's Got Talent viewers were convinced they had easily guessed how magician Damien performed his act on Saturday's show.
Damien O'Brien, whose day job is as a personal trainer, got each judge to pick a date that was special to them. Simon Cowell was up first and he chose February 14th, which was the date his son Eric was born.
Damien had David Walliams type that date into a calculator on Damien's phone, before moving on to Amanda, who chose 10th December, the date she married her husband, and got David to press multiple.
Alesha, who chose the 1st October, the date her daughter was born, and David was then asked to add that date into the calculator too, before pressing divide.
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