A young polar bear goes to his mother and asks “Mom, am I a full blooded polar bear?”
His mother says, “Well, my mother and father were polar bears, and all of my grandparents were polar bears, so I’m a full blooded polar bear, so you must be a full blooded polar bear too.”
The young polar bear replies “OK.” and wanders off dejectedly.
A little while later he goes to his father and says “Dad, am I a full blooded polar bear?”
His father says, “Son, of course you’re a full blooded polar bear. I’m a full blooded polar bear, my parents were full blooded polar bears, all the way back in our family tree all your ancestors have been full blooded polar bears.”
He replies “Ok.” and wanders off again.
That night at dinner, the young polar bear asks “Mom & Dad, are you sure I’m a full blooded polar bear?”
His parents look at each other and say “Son, we’ve both explained to you that we’re full blooded polar bears, our parents were full blooded polar bears, their parents were full blooded polar bears, and so on. You are definitely a full blooded polar bear.”
He replies “Ok” once again.
His parents then ask, "Son, why are you so concerned if you’re a full blooded polar bear?
He looks at both of them for a second and answers,
“It’s just that I’m fucking freezing.”