Because you have to hollow out the head.
With an icy-stare!
Frostbite!
To keep her head warm.
One guy threw down his hand and another laughed his head off. This was my best friend's favorite joke when she was little apparently.
Snowballs
Snow balls. Ha
It takes too long to hollow out her head. (I got this one from my uncle)
You have to hollow out the head.