What is laughter?

Laughter is the child of surprise. If you can make each other laugh, you can always surprise each other. And if you can always surprise each other, you can always keep the world around you new.
-Calsanz, Partners and Marriage

A fairy is born through a child's laughter. If it's a half-hearted laugh, the fairy is born with defects - smaller ears, one instead of two wings, or difficulty in making magic. This is why we must all laugh fully.
- a Disney publication on Tinker Bell