Deviant Art today to discover that all the user icons had been changed to things like Lady Gaga and Twilight. That's a little weird, kind of annoying and not really funny, at least in my opinion. It's made worse by the fact that they've basically done it before, except they gave people "I herd u like mudkips" icons back then. Not as bad, but I still didn't like it.
One reason I don't like the icon swap is because on top of not being that funny, it's something forced upon the user and possibly leaving them with an icon that represents something they hate. There are people who not only don't like Twilight, but are genuinely offended by the lessons it supposedly teaches young women. An icon swap for one day is ultimately not a big deal, but it's still a bit dickish to force someone of that viewpoint to use a Twilight icon for any period of time.
I'm repeating myself from Twitter, but It would have been fun and amusing if they changed up other graphics on the site, replacing their mascot with various funny images. It would give people something new and provide a fun meta-game treasure hunt for the site. The "haha your icon is co-opted and possibly something you hate" is less funny joke and more middle finger.