Hey I just remembered seeing a movie a while back, I'm not sure if it was in english, but this man, I think it was jet li but I could be wrong, he is a bodyguard or something along those lines and this kid gets a squirt gun that looks very real and it gets swapped with a real gun and him or his friend shoots the gun thinking its just a toy and it hits this fat man, I remember that they ask the fat man if he is OK and he says yes he was wearing his bulletproof vest.
