Historical clue formulations

• Without forethought, say — 2025-04-29
• Impulsively — 2021-04-14
• Just because — 2019-07-04
• Because why not? — 2018-12-20
• Just because — 2016-02-17
• Impulsively — 2009-12-23
• For the heck of it — 2008-05-14
• Just for kicks — 2002-06-07