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Re:AdultFriendFinder was hacked by Cyph0n on Sunday November 13, 2016 @12:50PM (#12944542)
That caps lock case is a good one, but I don't really see other realistic instances where you wouldn't just say "username or password is incorrect".
Re:AdultFriendFinder was hacked by kpdyer on Sunday November 13, 2016 @01:02PM (#12944599)
A few other cases: transcription errors (i.e., mistaking 1 for l), wrong case of the first character of the password, extraneous character at the end of a password, etc.

The paper I linked to actually does a good job motivating specific classes of typos by looking at real typos from Dropbox users.