A baby polar bear asks his mother "Mommy, am I 100% polar bear?" The mother looks up in thought, and replies "Well, your father is 100% polar bear, and I'm 100% polar bear, so I'd say yes, you're 100% polar bear."

Not satisfied with this answer, the baby polar bear goes to his father and asks "Daddy, am I 100% polar bear?" The father pauses briefly, and responds "Well, your mom's parents were both 100% polar bear, and my parents were both 100% polar bear, so yes, you're 100% polar bear."
The father then looks at his son and says "why do you ask?" The son replies "because I'm FUCKING FREEZING!!!!"