I spent ages trying to find this joke again
Baby Penguin asks his big sister: “Are you sure I’m a penguin?”
And his sister says: “Yeah. Look, you live on an iceberg and have a black and white coat just like mine”
So Baby Penguin goes to his mum and says “Mum, are you suuure I’m a penguin?”
Mum: “Of course you are silly. Look you have a beak and flippers, you can swim but you can’t fly and you eat fish”
So he goes to his dad: “Dad, are you suuuuuuuure I’m a penguin??”
Dads says: “Of course, why do you ask?”
Baby says "Cos I’m blimmin’ freezing!