Say I sell snake oil, and I say it will cure cancer. Then Peter comes and buys it because he lubricates his discumbulator machine with it. It has a legitimate u

Say I sell snake oil, and I say it will cure cancer. Then Peter comes and buys it because he lubricates his discumbulator machine with it. It has a legitimate use, and maybe I even know that, but I still sell it as a cancer cure (which it isn't). Its still snake oil.