a little boy comes in to the kitchen one day & says to his mum,grannys got a prawn!, the mother says"what an earth do you mean?,the boy takes him mum & shows her granny,stark naked asleep on the sofa,he points to grandmothers protruding & says,"grannies got a prawn!, his mother whispers"thats your grandmothers son",to which the little boy replies,well it tastes like a prawn!