Neon Genesis Evangelion 23-26 END
Evangelion is a series that I've been trying to watch for literally years, but never seemed to actually reach the end of. Immediately after catching up on the ~Monogataris, I finally got around to watching these last three episodes. I already had a fairly clear picture of how the series ended due to internet osmosis, so it was something of a surreal experience (well, more surreal than it would be anyway) actually watching these last few episodes at last - they felt at once incredibly familiar and yet new at the same time. But at least now I know where the "Omedetou" meme comes from!
On a side note, I still haven't got around to watching End of Eva (or the Rebuild movies, lol). I should probably do that at some point.