What's a great riddle you like?

This is your brain trying to answer my question
This is your brain trying to answer my question
A turn of phrase that makes you smile? Or a moral or philosophical conundrum that can never really be answered? An intelligence/reasoning test? I am open to interpretation.

I like "... it is a riddle, wrapped in a mystery, inside an enigma".
A Winston Churchill's radio broadcast in October 1939: "I cannot forecast to you the action of Russia. It is a riddle, wrapped in a mystery, inside an enigma; but perhaps there is a key. That key is Russian national interest."
What's a great riddle you like?
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