Video here :
http://www.youtube.com/watch?v=V4D8w2v7IB8
"A cab driver who had been waiting for a client at the BBC Television Centre in West London, when a studio manager mistook him for the IT industry expert, Guy Kewney. Confused but co-operative, he agreed to follow the manager to a studio, where he was promptly fitted with a microphone and placed in front of a camera on Live TV."
Newspaper article on this incident here :
http://www.timesonline.co.uk/article/0,,2-2178097,00.html
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lol..His face at the start is hilarious.