Historical clue formulations

• "Ah, yes, I'd been meaning to tell you ..." — 2019-12-20
• "I meant to tell you ..." — 2017-04-14
• "Since you asked ..." — 2015-02-21
• "Since you mentioned it ..." — 2014-05-03
• "Er, yeah, regarding what happened ..." — 2013-09-12