punchlines get spun all the time..i could think of a nice punch right now and chances are someone in the world used it in some way..but to actually go out your way to find something someone said and spit it word for word as your own is not cool..
but i could careless cuz at the end of the day im not the one who has to carry it around..so if you enjoy rapping for the love of the game and respect the art pick your biting ass up off the ground and keep grinding
peace