1. There is a Santa Claus, but he'll only visit you if you're good.
The threat of Santa is enough to keep many kids' behavior in check all year long. Parents tell their children that they keep in contact with him throughout the year, so they better behave. This also applies to the Easter Bunny, Tooth Fairy, and other made-up characters we tell our kids are real. When our children find out we've been lying to them, it can be devastating. It might even make them question everything you've ever told them throughout their childhood. Or maybe that's just me.