“Have you 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,” said the Hatter.
“Nor I,” said the March Hare.
Alice sighed wearily. “I think you might do something better with the time,” she said, “than wasting it in asking riddles that have no answers.”
– Alice In The Wonderland
Enquiries have been so often addressed to me, as to whether any answer to the Hatter’s Riddle can be imagined, that I may as well put on record here what seems to me to be a fairly appropriate answer, viz: ‘Because it can produce a few notes, tho they arevery flat; and it is never put with the wrong end in front!’ This, however, is merely an afterthought; the Riddle, as originally invented, had no answer at all
– Lewis Carrol
The best answer I could find:
Because Poe wrote on both. (Puzzle maven Sam Loyd, 1914)