Another version of this goes:

Little Johnny doesn't start speaking at the normal age. Not a single word has ever passed his lips. His parents have had him to child psychologists, speech therapists, the lot, and they are nearly at the end of their tether.

One morning at breakfast, when he's seven years old, he suddenly blurts out, "Jeez, this porridge is bloody shite!"

His parents are amazed and delighted. Dad says, "Johnny, oh, thank God, you can speak! But tell us, why have you never spoken before?"

The boy replies, "Everything's been all right up to now!"