What's your favorite Boss of any game ever?

Im going to have to say the Final-Boss on the dungeon The City in the Sky on The Legend of Zelda Twilight Princess. The boss is a huge dragon that is heavily armoured to start. You use your grappling hook to grab on to his tail, then you put on your iron boots to pull him down. When he falls some of his armour falls off. Once all his armour falls off, these things that you can grapple on to float above the arena. You grapple from one to the other, dodging the dragons fire. Once you get behind the dragon, you grapple on to his back, and start slashing at it. After you do that couple times, he finally dies. He is one of the funnest booses I have ever fought against in any game.