In the Yu-Gi-Oh! The Abridged Series stand-alone video Pharaoh's Throne, Yami Yugi sings the lines:
♪ Not for nothing but your nonsense is kind of a bore ♪
♪ I was more intimidated by those guys from Season 4 ♪
While the lines are very clever-sounding and inherently funny IMO even without context, I am curious as to who it is referring to. Who are "those guys from Season 4" that the song references who are apparently a joke? Unfortunately, the YGO:TAS is a very extensive series at this point, and I am not familiar with all of the episodes.