Culinary hybrids didn’t just start with the cronut. While the tasty cross between a croissant and a doughnut had people lining up outside a New York City bakery in 2013, it was only one part of an insidious trend that has the fast-food industry competing to create the next big food craze. “Big” is the key word here. About 13 percent of the world’s overweight population lives in the United States, and these outrageous items offered by fast-food chains aren’t helping our collective waistline. From the Krispy Kreme cheeseburger to the waffle taco, click through for five food mash-ups that should never have happened.