Bongo Bongo

Bongo Bongo was a mysterious creature sealed deep in the darks of the Kakariko Well. It is unknown the true nature and origin of the beast (though it is implied that Ganondorf was involved with it) but it guarded the Shadow Temple after Ganondorf conquered Hyrule and got released from the Well Seal, in Ocarina of Time. It is by far the weirdest boss yet to appear in a Zelda game. If you play the game normally, he is the next-to-last Temple boss to cross your path. To defeat him, equip the Lens of Truth, stun his hands with arrows to reveal his giant eye, shoot the eye with another arrow and hack it with your sword. Once you repeat this process enough times, this evil will be no more. The ice arrow will also freeze a hand if hit.

Oddly enough, Bongo Bongo is battled above a giant drum. Not only does he beat on it, but he sings throughout the battle with a voice much like the giants in Termina.