Historical clue formulations

• "Understood?" — 2025-12-26
• "Capisce?" — 2021-11-07
• "I'm baffled" — 2021-05-16
• "Hell if I know" — 2018-03-14
• "Heck if I know" — 2018-02-17
• "Hell if I know!" — 2017-02-23
• "Good question" — 2010-03-31
• "I'm stumped" — 2009-10-07
• "Dunno" — 2009-05-26
• "I haven't the foggiest!" — 2008-12-05
• Perplexed pronouncement — 2004-01-09
• "I'm stumped" — 2000-07-28