Say: ‘flibbity bibbity’… go on, say it. Say it at just the right speed, and your lips will bounce off each other. Say it forcefully. Play with the pronunciation… it might take a little practice to get it just right. But I promise that it will cheer you up when you feel a little low.
It is also fun to say in front of random people… like in an elevator full of people you don’t even know, or at the dinner table with your family. Don’t explain to anybody why you are saying it. Just say it.
Oh, and say it to kids… they love that.