Funny thing, his laugh is part of the music track.
I didn't even mean his actual boss fight music, I mean the music the leads into all the boss fights. I know it's supposed to build tension but at 5 years old I didn't know what "tension" was, only that walking onto the one lit square haunted me for almost three years of gaming. Beat Mario 64 and Banjo-Tooie long before I beat Mad fucking Jack.
Of course the rest of the bosses in the game are easy as shit, except K. Rool and Cardboard Cutout HA HA K Rool. Go figure.
Mad Jack was just a fuck. Still triggered by it to this day and it's been 20 years.