You can check in their GitHub repo [1] the list of reasons to reject your password (classified by level of "InfuriationLevel"). Some examples:

'Password must contain at least 1 primary Simpsons family character'

'Password must contain at least 1 Nordic character'

'Password must contain at least 1 Greek character'

'Password must contain at least 1 primary Griffin family character'

'Password must contain at least one emoticon'

'Password when stripped of non-numeric characters must be a number divisible by 3'

[1] https://github.com/troyhunt/password-purgatory-api/blob/mast...