I noticed that this user on Sustainable Living SE has got the 'Ghost of Winterbash Past' hat and I'm very much wondering how he got it.
My first guess was that the hat can only be earned if you did something special during Winterbash 2012, but.... Sustainability SE didn't exist then. I checked several other beta sites that didn't exist during the previous Winterbash (Tridion, Reverse Engineering, Italian Language), and there is no user with this hat there.
The second strange thing is that the user hasn't logged in since november 24th, so I guess it was assigned at the start of Winterbash.
Is it a bug that this user got the hat? Or is this just part of the mystery surrounding the Ghost of Winterbash past?