I've had students of several different backgrounds and religions in the short time I've taught. One day we got into the (dangerous!) discussion about the tooth fairy. A couple of my students didn't celebrate holidays or childhood characters, and one of these kids said,
"I don't believe in the tooth fairy because it goes against my gods. But I really want to test it out just to see."
I don't know if she did or not! I should have checked. ;o)