This was definitely a lot of fun, and I absolutely hope that Anet considers bringing this back for Halloween. Imagine the Mad King Thorn doing this? The entire of Lion's Arch dominated by a thousand bone horrors, chewing their way through all of his fans? Yes please!
If you wish to see a video of the bone horrors going to town on the Jade Quarry, Relyk has posted one here: http://www.xfire.com/video/4e844a/
See you all soon when the Mad King comes to call!