September 18, 2008: Castiel First Appears on Supernatural and Destiel is Born

TEARFULLY: We love you.

STOICALLY: This week's episode is about the introduction of Castiel and the birth of Destiel (plus the 2007 WGA strike).

Sources

Fanlore
Wikipedia

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September 26, 1975: Rocky Horror Picture Show Premieres

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August-November 1988: "A Death in the Family" Divides Batman Fandom