The boy was shoving sweet tarts and chocolate bars down his throat as fast as possible, so much that it prompted the man to offer some advice: "You know, Johnny, it's not healthy to eat all that candy."
Little Johnny looks up at him and quickly retorts "You know, my grampa lived to be 96 years old."
"Oh," the man replied, "did he eat lots of candy?"
"Nope," retorted Little Johnny, "he minded his own damn business!"