The Secret of Secret Hats
7757
Winter Bash 2017 Hats
57489
Does the Sorting Hat speak only to the person wearing it?
41851
The Ability to Hide Questions
75472
Hats can block page controls
11296
The Monty Hall problem
13552
Clever bounty reputation hack
23256
Hat duplicates when info is expanded
158405
Explanation of Freeman Dyson's solution of the counterfeit coin problem
37838
A riddle about guessing hat colours (which is not among the commonly known ones)
112068
How was the sword of Gryffindor pulled from the hat a second time?
51079
How are hats for the Community user selected?
58581
an \underhat and \underwidehat
70222
Top-bar hat misplaced
73117
Secret santa algorithm
93902
Hat inconsistencies in iOS app
20754
Super Secret Settings
37472
How about multiple hats?