A young little blonde girl comes back from school one evening.
She runs to her mum and says: "Mummy today at school we
learnt how to count. Well, all the other girls only counted to 5, but listen to me: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 ! That's good, innit?"

"Yes darling, very good."

"Is that because I'm blonde?"

"Yes darling, it's because you're blonde."

Next day, the girl comes back from school and says: "Mummy,
today at school we learnt the alphabet. All the other girls only
went as far as D, but listen to me: A, B, C, D, E, F, G, H, I, J, K!"

That's good, innit?"

"Yes darling, very good."

"Is that because I'm blonde, mummy?"

"Yes darling it's because you're blonde."

Next day, she returns from school and cries:

"Mummy, today we went swimming, and well, all the other girls
have no boobs, but look at me!"

She proceeds to flash her impressive 36 D at her mum.

"Is that because I'm blonde, mummy?"

"No darling, it's because you're 25."