Halloween has only recently been imported to the land of the rising sun, so unlike Christmas—which in Japan is mostly a time for a romantic date—its presence hasn't been felt much in anime. This was possibly best illustrated in The Melancholy of Haruhi Suzumiya, where the titular Haruhi decided to celebrate the holiday but had no idea how. There are hints of it, but the details of the event itself tend to remain a mystery.

Nonetheless, Anime New Network has tracked down a total of six instances where anime went into Halloween territory, and even got it right. Oddly enough, the first example goes all the way back to Dirty Pair. And if the image above didn't give you a hint, Ouran High School Host Club is in there, too.