This riddle sounds mysterious because the clues describe something that seems almost human: it has a mouth and wears a crown, yet it never says a word.
The trick is that the answer is not a living king. Think instead of an image of royalty that can have a face, a mouth and a crown but can never actually speak.
Answer: A king on a playing card.
The king pictured on a card has a mouth and is shown wearing a crown, but because it is only an illustration, it can never speak. That is what makes the wording work so well.
Did this one fool you, or did the crown give the answer away?
