When parents take their jobs too seriously, they cease to appreciate their children's childlike innocence. They start to care more about being right than having fun. They think they're being "adult," but really they're being "adulterated." :)
"Childlike" is not the same as "childish," which is when a child behaves like a caricature of an adulterated adult. Childlike adults seek unadulterated fun: responsible but light-hearted and playful.
Today, let your child's commitment to fun inspire you to relax and be more childlike. And when you're tempted to take parenting too seriously — to "adulterate" — just tell yourself, "Thou shalt not commit adultery." :)