Find the story, Granny Weatherwax always said. She believed that the world was full of story shapes. If you let them, they controlled you. But if you studied them, if you found out about them... you could use them, you could change them.
Terry PratchettDrinks like this tend to get called Traffic Lights or Rainbow's Revenge or, in places where truth is more highly valued, Hello and Good-Bye, Mr. Brain Cell.
Terry Pratchett