Three Secrets

Erik wrote the following, while I was in Orlando for a meeting recently ...

At lunch today, Sven informed me that there is no Tooth Fairy, laying out for me a chain of reasoning from Easter Bunny through Santa to Tooth Fairy. (After some thought, he is still prepared to accept money for teeth, so long as everyone is clear that the money is coming from Mom and Dad, and not T. Fairy.)

Sven refers to these three mythical figures as the "Three Secrets" that parents (try to) keep from children. He doesn't seem much bothered to discover this state of affairs.