Mai-HiME Episode 4
Panties and bras start vanishing from the girls' locker room, and a little gremlin-like Orphan is to blame. Natsuki is the victim of one such incident, and goes on a mission to find out who the culprit is. Upon baiting and finding the Orphan, she discovers there are many of them and they combine into a giant tentacle monster Orphan! Mai and Mikoto defeat the monster, but all of the underwear has been destroyed...
Wow, this was a hilarious episode. Not only was the humor great, but the music really stood out in this episode as well. Even tho it was mostly a filler episode, I hope they have more of this kind of stuff down the road...