Baby polar bear goes up to his Mum and says "Hey Mum, am I defo a polar bear?"
"Course you are son. Your fur's all white, you live in the Arctic, I'm a polar bear, your Dad's a polar bear, so yes, you're definitely a polar bear".
Ok thanks Mum.
He then goes up to his Dad and says "Hey Dad, am I defo a polar bear?"
"Course you are son. Your fur's all white, you live in the Arctic, you eat lots of fish, I'm a polar bear, your Mum's a polar bear, so yes, you're definitely a polar bear".
Ok, ta Dad.
Finally, he goes up to his Granddad and says "Hey Granddad, am I defo a polar bear?"
"Course you are son. Your fur's all white, you live in the Arctic, you eat lots of fish, you chase seals all day, your Mum's a polar bear, your Dad's a polar bear, so yes, you're definitely a polar bear".
Ok, thanks Granddad.
"Anyway son, what's all this about? I'm the third person you've asked that question to in the last five minutes, is anything bothering you-why do you keep asking if you're a polar bear?"
Well, Granddad I just wanted to make sure, because I'm absolutely fucking freezing.