What is it about snow that makes people, children and adults, and animals get so goofy?

One time I was subbing in a class room. I was in front of the class talking, when I glanced out the window. Suddenly I stopped talking in mid sentence and my head was hanging low.
“What’s wrong Ms V?”
Big sigh.
“It’s snowing.”
Pandemonium ensued as every kid rushed the windows, like I knew they would! I tried to turn it into a teachable moment with random crap about snow, but mostly we just watched an marveled. It wrecked the room for a good 10 minutes. :D

And my Dakota would just plow through it like a big white kid-bear. She obviously enjoyed it.

So what IS it about snow that makes us goofy?