<sup>I marked this as community wiki for a reason. Please feel free to edit it with images, more information about a hat, or anything else.</sup>

# Chameleon
Chameleon is tricky. It is currently unknown _exactly_ what the trigger for it is, but it includes editing your profile.

The current theory is that you are randomly assigned a name of a profile field (e.g. About Me, Website, Location). Editing that specific field will give you the hat.

Things that have been known to trigger the hat:

 - Editing only the About Me section
 - Editing only the Website field
 - Editing both About me and Website
 - etc.
 - Creating a new account on a site, i.e. attempting to log in on a site you have not created an account for, and then clicking "Confirm And Create This Account"

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# Eureka
Eureka is manually awarded by the Stack Exchange staff to users who independently guess exactly how to get any secret hat.

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# Fascinating
Fascinating is earned by upvoting an answer that is accepted and has a score of at least 5.

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# Fascinating, Ma'am
Fascinating, Ma'am is earned by upvoting a question that has a score of at least 25.

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# Hairboat
Hairboat can be earned by commenting on one of [abby hairboat][1]'s posts.

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# Time Lord
Time Lord can be eared by editing 5 old questions.

It is unconfirmed how old the posts have to be, and whether it can be earned by editing answers.

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# Waffles
Waffles can be earned by voting on a post, editing it, and then changing your vote.

It is unconfirmed whether is it possible to earn it by changing you vote after someone _else_ edits the post.

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# Warm Welcome
Warm Welcome is earned by upvoting a new user's first post.

It is unconfirmed exactly how new the user has to be.


  [1]: http://meta.stackexchange.com/users/165581/abby-hairboat