A little polar bear goes up to his mum and asks her, “Am I real polar bear?”
“Of course you are” his mum replies. “I’m a polar bear, your dad’s a polar bear, so you’re a polar bear”.
“But are you sure I don’t have any brown bear or grizzly bear in me?” he asks.
“Listen, if you don’t believe me go ask your grand-dad”
So he goes and asks his grand-dad
“Grand-dad, are you sure I’m a polar bear. I don’t have brown bear or grizzly bear in me?”
His grand–dad looks down on him and smiles.
“Listen, my boy, I’m a polar bear, my mum and dad were polar bears, and your granny, she was a polar bear, so your dad is a polar bear and so is your mum and her mum and her dad and her grand parents. We’re all polar bears so you are a pure, 100% polar bear”
The little polar bear doesn’t look convinced so his grand-dad asks him’
“What’s worrying you?”
“Well” he replies, “If both mum and dad are polar bears and all my grannies and grand-dads are polar bears, and even their mums and dads were all polar bears, and there’s no trace of grizzly or brown bear in me……then why am I so fucking cold?”