Historical clue formulations

• Lose it — 2023-08-13
• Do as Henry VI did — 2021-04-04
• Snap — 2016-11-06
• Crack up — 2016-09-25
• Flip — 2016-06-25
• Flip — 2013-02-16
• Lose touch with reality — 2012-11-18
• Lose one's marbles — 2011-12-07
• Lose one's marbles — 2008-01-13
• Flip out — 2007-04-08
• Flip out — 2005-09-27
• Lose one's mind — 2004-08-11
• Lose it — 2000-12-15
• Lose it — 1997-07-31