Historical clue formulations

• Part of the joke — 2021-09-26
• Privy to a practical joke, say — 2018-06-08
• Being part of a secret — 2017-05-21
• Part of a prank, say — 2016-05-16
• Privy to a practical joke, say — 2014-10-08
• Part of a plot — 2013-02-16
• Part of the conspiracy — 2011-11-21
• Privy to the gag — 2011-01-07
• Not unaware of the joke — 2007-10-14