Day 22 - Favorite series finale
I would say Dawn French marrying Richard Armitage in "A Wholly Holy Happy Ending", due to a maid of honor dressed as the Tenth Doctor and Dalek attendants, but they pushed for one last OTT humiliation joke and it made me very sad.
So instead I went with Blackadder: "Over the Top". Sniffle. (Warning: spoilers. This is the very last scene.)
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