Historical clue formulations

• "We have a mutual friend?!" — 2026-05-29
• Earth or Tatooine — 2023-05-15
• "I can't believe we both know him" — 2018-10-23
• "Huh, you know him, too?!" — 2018-06-17
• *"Crazy to run into you here!" — 2018-01-29
• "You know so-and-so, too? How about that!" — 2017-02-10
• "I can't believe we both know him" — 2015-05-11