For so many reasons - humor, surrealism, silliness, mood changing, cleverness...
Trudging up the stairs after dinner, Julia looked up at me waiting for her (and guarding the top step from an incursion by her sister), smiled brightly, touched the top of her head with her index finger, and fairly shouted, "If I had a hole in my head, I'd put a flower in it!"
That's my new motto.