I've been wanting to get my three sons into the hobby, and I think their favorite movie trilogy is a worthy starting point.  I see Christopher Lloyd does a lot of appearances lately.  What about the rest?  Is Crispin Glover a good signer?  I've seen a few of his on ebay, but it seems like his would be fairly easy to forge.  What about Michael J. Fox?  I've never heard of him doing signings, but his signature appears often.  presspasscollectibles on ebay has a beautiful 8x10 for sale, and it…