Theymos trolled everyone, avatars changing themselves. Login with an alternative account and see your original account 
I can also confirm this.
I thought everyone's avatars were crap. I thought my avatar was cool, now I know how other people see me
Lol, that's exactly what I was thinking. I kept wondering why is everyone putting up such silly looking avatars and I thought maybe they're trying to be funny.
Here's another thread in Games & Rounds and I think this dude is also trying to make april fool. https://bitcointalk.org/index.php?topic=1009215.0