We eat junk food because we know it's bad for us and we get pleasure from this, it's enjoyable. But on the scale of crimes as perceived by The Law, consuming junk food is hardly a great offense; it hardly even offends the senses. Now, if you were to consume something that was actually illegal or at least extremely controversial, imagine the proverbial rush from that.
This is a list of meals and delicacies that push the envelope, with some of the latter dishes going on to open up said envelope, read what's inside, set fire to it and then snort the ashes. These are the culinary equivalent of murder, of robbing a bank, of snatching an old lady's purse. They are at best controversial and at worst, downright illegal. But all are delicious. Probably.