I've somehow earned the
Towering Pillar of Hats Johnny Three-Hats, but the description is, well... less than descriptive.
Is this hat awarded randomly? If not, how did I earn it?
From an answer to the same question on Meta.SO:
The Johnny Three-hats hat is earned by (spoiler below)
earning three different hats on one site, within one day. Hats earned on different sites, on previous days or before the Winterbash started do not count.