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A naked teenager , high on a new 'zombie drug ' tried to cut off his own penis while wandering around the streets.
The boy had already smashed his head into a bus window as terrified passengers were locked on board.
He then lay down on his aback in the road with a knife and tried to hack at his groin.
An shocked bus passenger filmed the scene in the La Colorada neighbourhood of the Argentine capital Buenos Aires.
The teen, who was not named, was also said to have bitten his own arms and had blood around his mouth, but this was not recorded in the footage.