Favourite Boss Battle in MGR:R

[Jassassino]

What's everybody's favourite boss fight in Metal Gear Rising Revengance? For a game which is built almost entirely around a one-by-one killing spree, I feel it really encapsulates it by giving us some truly unique and fun boss fights, with fantastic music, weaponry rewards and (a lot of) fun meme dialogue to boot. 

I feel like, since Metal Gear Rising's popularity has skyrocketed, memes have also meant that Senator Armstrong takes center stage amongst every boss option - but I wouldn't necessarily say he's my favourite, despite it being filled with the most laughs and a lot of good mechanics to keep you on your toes. Instead, I'd probably choose either Monsoon (who I always found quite difficult!) or Sam (vibes).