Now I know what you are thinking; “how did he know what was drawn in the envelope?” Clearly, I must have detected in his voice the accent of my home … - Derren Brown

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Now I know what you are thinking; “how did he know what was drawn in the envelope?” Clearly, I must have detected in his voice the accent of my home town, Bristol, so he’s only going to be thinking of a tractor or marrying your own sister. A tractor's easier to draw so Bob's your uncle... and your Dad. And you'd be right.