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17 April 2013, 11:15
Watch what happens when a prankster yells the teen's name to unsuspecting passengers.
A prankster's video of himself screaming Justin Bieber's name on the London Underground has gone viral.
The man, known as Brave Dave, sits in the carriage reading his newspaper and yells the Canadian pop star's name as loud as he can.
He is also seen standing on the platform with a group of surprised school children around him at one point.
The comedian looks away oblivious to what's happened and carries on reading his paper as the public look on.
His loud screams shock many with others simply laughing at his actions.
Check out the Justin Bieber screaming London underground prank below:
Meanwhile, Justin is currently on his 'Believe' world tour and caused controversy when the jaunt hit the UK earlier this year.
He was involved in altercations with paparazzi and came under fire for arriving on stage two hours late for his first London O2 Arena gig.