This bungling robber was caught after he poked a checkout girl in the back with a knife - in the same supermarket queue as an off-duty POLICEMAN. The 25-year-old attacker in a black baseball cap calmly pulled out the 12-inch long weapon and prodded the terrified shop assistant with it. She opened the till for him to grab cash - but the thug didn't notice off duty civil policeman Osmar de Albuquerque Pontes Junior waiting to pay fro groceries behind him in the queue - despite Osmar wearing his white police polo top. The ice-cool cop pulls out a handgun and holds up the crook who put up a brief fight with police before being overpowered in Prudentopolis, Brazil.