Historical clue formulations

• "Nuh-uh!" — 2025-11-24
• "Ain't gonna happen!" — 2024-09-22
• "You're kidding!" — 2023-05-14
• "You must be dreaming" — 2022-07-29
• "Forget it!" ... or a hint to 17-, 30-, 46- and 62-Across — 2018-01-18
• "Ain't happening" — 2016-04-10
• "Can't be done!" — 2014-12-22
• "Don't even think about it!" — 2010-11-23
• "Keep dreaming!" — 2010-07-01
• "You gotta be kidding me!" — 2010-02-01
• "Inconceivable!" — 2008-09-10
• "Impossible!" — 2007-10-16
• "Not a chance" — 2005-05-24
• "Forget it!" — 2003-10-08
• "Forget it!" — 2003-07-02
• "Not a chance!" — 2000-11-09
• "Nothing doing!" — 1998-02-25
• "Forget it!" — 1997-08-10