Baby polar bear asks Daddy polar bear, " Dad, am I 100% pure polar bear?"
To which Daddy polar bear responds, " Well, son, both my parents were 100% pure polar bear, and both your mother's parents were 100% pure polar bear, that makes us both 100% pure polar bear. So yes, son, you are 100% pure polar bear. Why do you ask?"
"Cuz I'm freezing my ass off, Dad!"