Historical clue formulations

• "Be reasonable" — 2024-02-24
• "Let's get real here ..." — 2017-05-19
• "Don't be absurd!" — 2014-04-28
• "You've gotta be joking ..." — 2013-04-02
• "You must be joking ..." — 2011-02-17
• "Let's be reasonable ..." — 2007-07-06