One day, in the frozen north, a polar bear and his son were out for a stroll. The father bear sat on a lump of ice to admire the view and sent his son off to play.
Two minutes later, Junior returned. "Can I ask you a question, Dad?"
"Sure, son. What is it?"
"Am I a real polar bear, Dad?" asked Junior.
Dad smiled and said, "Of course you are, son. Now go and play."
So off Junior went again, throwing some snowballs at the seals, but soon he was back.
"Hey Dad, are you sure I am a real polar bear? Is there not a wee bit of brown bear or black bear in me?"
Dad smiled again and said, "Look, son, you've got big hairy black feet, a white coat, and a black shiny nose... of course you're a polar bear. Now go back and play."
Once again, Junior ran off. He slid down the ice, chased a couple of seagulls, and after ten minutes of fun, he returned with a puzzled look on his face.
"Daaaad... are you absolutely sure I'm a polar bear?"
"Look, son... I'm a polar bear, your mum's a polar bear, your granny and grandpa were polar bears... why are you asking all these questions?"
Junior looked up and said, "'Cause I'm freaking freezing!"