Bad Marketing
Diet Coke is coming out with Lime Diet Coke. So naturally they use the "put the lime in the coconut" song and change coconut to diet coke. Which worked. But then the voice-over comes in and says, "That's right, we put the lime in the Diet Coke" as if the listeners are completely stupid and couldn't understand it. And it's really, really, terribly bad. They completely ruined a good thing.