One of my friends has a child who recently started losing baby teeth. The first time it happened, my friend told him the fantastical tale of how the tooth fairy would likely visit and leave him some money.
Although his son appeared skeptical about this magical creature, he caught the boy placing the tooth under his pillow just before bed.
His son simply looked up, shrugged, and said, "I know it probly ain't real, but I really want that quarter."