Ok this one needs a little setup....
Live on BBC News 24, BBC consumer affairs correspondent Karen Bowerman interviews a man who she believes to be Online Music Expert Guy Kewney.
It was originally reported that he was a taxi driver who has no idea what's going on and knows absolutely nothing about what he's being interviewed on, but it emerged later that he was Guy Goma, a graduate from the Congo who was there for a job interview instead.
His expression once he realises he's being interviewed on air is absolutely priceless.