Dear colleague,
I'm much too polite to tell you, but I have been quietly celebrating all day since I heard that they removed you from your important, key administrative position and gave you a mysterious job with a nice title and no duties. Some of your newly-former employees feel the same way. The new administrator actually seems both pleasant and sane. Would it be impolite for us to send out for pizza?
Pizza is fine. Ice cream and cake, however, would be too overtly celebratory.