Bongo Bongo is easily the hardest of the OoT bosses. None of the other fights are as fast-paced in terms of how rapidly the boss attacks, and even Ganon is more predictable
But Bongo Bongo makes up for a piss-easy dungeon (at least in normal mode. In Master Quest the Shadow Temple really got revamped well)

Monster Hunter: pissing me off since 2010.







