Blonde Girl

A blonde girl comes home from school and says to her mum,

"mummy I was the only one in the class who could do the whole alphabet"

her mum says "thats wonderful"

the girl says "is it because i'm blonde?"

the mother says "yes it's because you're blonde"

a week later when the girl arrives from school she says "mummy, we were in the showers and all the other girls were flat chested but i had these"

at that moment she rips her top off.

"oh thats very nice" says the mother (embarrased)

"is it because i'm blonde?"

"NO IT'S BECAUSE YOUR 25!"