Historical clue formulations

• "Something's not right here ..." — 2018-03-16
• "Something seems off ..." — 2016-02-13
• "Something is rotten in Denmark" — 2013-12-18
• "Pretty fishy, if you ask me" — 2007-03-24
• "Something's not kosher" — 2004-04-03
• "Something's not right here" — 2004-01-23