Historical clue formulations

• Nervous laughs — 2026-02-14
• Sneaky laughs — 2018-12-25
• Sneaky little snickers — 2017-08-02
• Little chortles — 2013-02-02
• Derisive laughs — 2001-01-28
• Sneaky laughs — 1998-04-24
• Exclamations of inquiry — 1994-03-27