Ravens and Writing Desks

Why is a raven like a writing desk?

According to history, Lewis Carrol's answer was "they are nevar turned the wrong way front". A writing desk is never used backwards, and "nevar" is "raven" backwards. But his brilliant editors thought it was a typo and changed it to "never", thus ruining the riddle.

But readers have posed their own answers:
"Because you can not ride either like a bicycle."
"Because they both come with inky quills."
"Because there is a B in both and an N in neither."

But my favorite, and by far the best answer is
"Because Edgar Allan Poe wrote on both."

And that is why a raven is like a writing desk.