There was a commercial a while back (for what? I don't remember) that poked fun at bad choices for breakfast. They showed this woman eating a gooey, sticky cinnamon roll walking by. Once she passed, her rump was literally two giant sticky buns!!
I like to use this tactic when faced with sweets especially. I can just picture my butt as two gigantic butterfingerss or whatever it is at the moment. It aides in preventing me from caving in to the craving. It doesn't always work but sometimes a mental image and a good laugh helps.