Historical clue formulations

• "Understood" — 2023-05-13
• "Roger that" — 2021-08-11
• "Roger that" — 2020-06-13
• "Ha! You fell for my trick!" — 2018-01-30
• "Um-hmm, O.K." — 2017-01-02
• "Understood" — 2011-08-06
• Prankster's cry — 2005-11-06