Why is a raven like a writing desk?

If the title isn't enough of a hint, I went to see the new "Alice in Wonderland" in 3D.  The movie was enjoyable if a bit mediocre - the CGI was excellent and I liked Johnny Depp as the Mad Hatter (not his best work, but entertaining enough).   However, the big let-down for me was Mia Wasikowska's performance as Alice... she seemed to fade into the background when the story was supposed to be about her.  The film had a fairly formulaic storyline (which isn't necessarily a bad thing) which could have gone a bit deeper - like why was the Mad Hatter mad?  Who was this Stayne guy?

As I said, it was entertaining and I'm glad I saw it.  I do love films that blur the line between what's "real" and what's just in our minds.  Is this a story about a girl who falls down a magic hole into an enchanted world or a persistent fantasy of a young woman who's unconscious mind is struggling to deal with the stiffing dictates of society?

Moreover, I'm glad I watched it alone because I had a lot to think about when it ended.  The film acted like a catalyst for a few things that I've been thinking about in regards to my life and some advice I've gotten over the past few years from family and friends.  So I spent the bus ride home engaged in an internal monologue and  musing on my life (those of you who know me can probably picture it :)... it was quite refreshing to have a good muse... hadn't had one in a good long while.  Do you think its indicative of anything that it takes a Tim Burton film for me to take a look at my life?  Hmmm.... lol.

Also, if anyone out there DOES know how a raven and writing desk are related, I'd love to know.