‘He claimed robbery was a joke’

A thwarted gunpoint robber who claimed he was pranking his victim was wrestled to the ground and sat on by his intended target, a court heard. A gun-wielding robber claimed he and his victim fell foul of the same prank-gone-wrong after he was pinned to the ground when his accomplice pulled out a knife and robbed the target for real, a jury heard. Mohammed Osman, 23, claimed he wanted to be a YouTube prankster when he pulled out a gun…