Historical clue formulations

• Sarcastic question answered by the starts of 17-, 25-, 51- and 59-Across — 2025-09-01
• *"Why am I not surprised?" — 2014-02-05
• "Yeah, and ...?" — 2012-04-13
• "Now tell me something I don't know" — 2006-03-20
• Gossip's question — 2004-02-13