Britain's Got Talent fans think they have worked out The Phantom's magic trick after their performance on Thursday's semi-final left judge Simon Cowell baffled.
During the show, The Phantom left the judges — Simon, Amanda Holden, Alesha Dixon and David Walliams — mystified with their mind-bending magic.
At the start of the performance, The Phantom asked David to think of a childhood memory and write it on a piece of paper, as well as the time it took place.
Amanda was then asked up onto the stage where she had to go inside a box where she became "invisible" just like The Phantom.
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