A video posted on YouTube shows the terrifying moment a man falls off his bike when thieves riding another motorbike try to force him to pullover at gunpoint.

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The victim was riding on a highway in Brazil when the pair pulls up alongside him, motioning for him to pullover, before one of the men reaches for a weapon in the waistband of his shorts.

The man tries to speed away from his attackers and falls of at 150 km/h. 

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