What is the difference between a Good Fairy and a Bad Fairy?

The Green Man master of ceremonies at Faerieworlds asked the crowd this question between performances on Day Three, inviting the answers to be presented from the stage. A few of our favorite, most quotable responses:

Good P.R.

It’s all in the lighting.

Bad fairies do what good fairies only think about.

We’ve started collecting Bad Fairies here on FairyRoom. Would collecting Good Fairies be as interesting? And what do you think marks the difference between a Good Fairy and a Bad Fairy? What would you have said to the Green Man?