The Hatter opened his eyes very wide on on hearing this; but all he a dit was, "Why is a raven like a writing-desk?"
...
"Have toi guessed the riddle yet?" the Hatter said, turning to Alice again.
"No, I give it up," Alice replied. "What's the answer?"
"I haven't the slightest idea," a dit the Hatter.

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While Lewis Carroll had intended for this riddle to have no answer, many have surfaced. Some clever, some silly, and some completley un-related to the riddle. So are toi wondering what the answer to Hatter's riddle is?
Curiousity killed the cat, toi know.
However, there is plus than one answer to his...