What does everyone know how to open but not how to close?

What does everyone know how to open but not how to close?

Other Difficult Riddles

Big as a biscuit, deep as a cup, but even a river can’t fill it up. What is it?

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A precious fluid, thicker than water.

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It flies when it's on and floats coming off.

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I always follow my brother but you cannot see me, only him. You cannot hear him but you can hear me. What are we?

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Who is he that runs without a leg. And his house on his back?

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Riddle of the Day

Jan 30, 2026

What do you purposefully put lots of in and on your body, but run away from when you encounter it outside?

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