Goku Sayonara Zetsubou Sensei - 1

You can get it from ggkthx.

The OP is freaky as usual. And we get talk of Valentine's Day ... with chocolate hearts ... and then there's Halloween ...

Halloween is not as original as it used to be. :lol:

Let's guess which anime characters cameo that showed up. :roll:

I don't think we have to do that. I'm sure there's some blogger or something bored enough make that kind of a list. One thing that amazed me was the (what I believe to be) Black God reference. It seems that it's at least popular enough to be mentioned.