Historical clue formulations

• "Oh, really?" — 2025-12-23
• Response to a surprising statement — 2012-05-12
• "Really?" — 2007-11-15
• "Who'd a thunk it?!" — 2007-10-06
• "Really?!" — 2007-02-03
• "Really?!" — 2006-11-28
• "You don't say!" — 2004-12-12
• "Oh, really?" — 2004-02-07
• "No kidding!" — 2003-08-01
• "Oh, yeah?" — 2002-12-18
• "Really?" — 2001-01-11
• "Really?" — 1999-08-28
• "No kidding!" — 1994-04-02