Terrifying video shows a building site worker dangling from a crane hundreds of feet in the air. He can be heard screaming while suspended by his hand under a pallet of construction materials as it is lowered between skyscrapers in Toronto, Canada. Onlookers are heard shouting to the man "Hang on!" as he flails his legs high above the ground. At one point his hard hat falls from his head and drops to the hard surface below.One onlooker is heard saying: "Oh my God, how the f*** did this happen?"