Historical clue formulations

• Flies off the handle — 2025-09-23
• Goes berserk — 2022-10-02
• Snaps — 2018-05-23
• Goes bonkers — 2016-03-21
• Abruptly becomes violet — 2014-08-23
• Snaps — 2011-07-10
• Explodes — 2011-06-04
• Goes postal — 2009-08-18
• Flies off the handle — 2008-02-06
• Snaps — 2007-06-14
• Flips — 2005-08-13
• Goes postal — 1999-01-20