Kudos to everyone who knows what this is referring to, and if you don't know and are confused, allow me to explain.
Berserk. There have been tons of other vague hints littered throughout the series, such as DBZ, Naruto, I believe there was a Sailor Moon one, but this is probably my favorite one so far. Have a favorite reference in the spoof series? Leave a comment and let me know, and I may do a feature article on it.