Historical clue formulations

• "You sure about that?" — 2026-08-30
• "That a fact?" — 2022-10-22
• "You sure about that?" — 2019-05-31
• "That so?!" — 2017-07-12
• "You don't say!" — 2008-02-22
• "No kidding!" — 2004-07-30
• "Is that so?" — 2003-02-21