Console Games With the Best Boss Fights

A great boss fight can be the highlight of a console game—something you talk about long after you beat it—but which console games do you think have the best boss fights, and what makes them so memorable? Is it the boss’s design (like a huge, imposing creature or a challenging human opponent), the mechanics of the fight (like having to learn patterns, use specific skills, or work with allies), the build-up to the fight (like a dramatic cutscene or story reason to face them), or the sense of accomplishment when you finally defeat them?