The song itself (there's not just this, there's others by different artists but I think this one is closest to it): youtu.be/uZ7Izh2dOUM
I watched a comedic video (I want to say it was gaming, like machinima style?...either that or it was using anime clips) that had the basic melody of the song. It was a bit faster, and it had completely different lyrics. Watched it probably 5+ years ago. I don't remember exactly.