oh, c'mon....i listened to that kid break his "arm" five times this morning, and WATCHing it, it's blatantly clear that it's not his ARM! A mild amount of attention shows that he's got his right arm inside his shirt and he's holding a mannequin limb or something. Also a giveaway: unless he has some kind of debilitating juvenile wasting disease, it's HALF the thickness of his left arm.
Lame. Now, if the arm swung back and forth, squirting like a giant truck-mounted phallus, THAT would be worth my valuable interweb time. Thank you.