We all know someone who's constantly singing, whether it's in the car, the shower or while doing chores.

Darren "Whackhead" Simpson poses as a producer from Idols.

He calls up his prank victim and gives her a spiel about fast-tracking her as a top 10 finalist if she passes the phone audition. 

She's all but happy to oblige and belts out 'Old McDonald Had A Farm' in the hopes to make it on the talent show.

The prank turns sour when Simon Cowell joins the call and critiques her rendition of Adele's 'Someone like you'.

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