A little boy comes into the Kitchen and says to his mum "Granny's got a prawn!"
Mum says "What on earth do you mean?"
The boy takes his mum into the front room and shows her Granny,who's stark naked asleep on the sofa.
He points to her protruding clitoris and says, "Granny's got a prawn!".
His mother whispers "That's your Grans clitoris son."
To which the boy replies....."Well it tastes like a prawn!"