Final episode of Sword Art Online, nooooo.
Like apparently the two users above, the last two episodes of the pile of shit that is SAO. No more of that; there's an obvious sequel hook but I have luckily no obligation to keep going.
Majikoi oh Samurai Girls
Episode 7 of Mahou Shoujo Madoka Magica.
Yu-Gi-Oh! Zexal episode 84.
Pokemon BW, the episode where Iris battled Drayden.
Look Forward, Team Rocket!
Also I claim Piplup in the Claim a Pokemon thread =)
Spice and Wolf
I speak four languages, help me practice please
Hablas conmigo en español, por favor
Vous parlez avec moi en français, s'il vous plaît
Episode 12 of Madoka. I'm afraid I didn't like it quite as much as everyone else, but it is by no means a bad anime. Give it a try, especially before the internet spoilers you.