6. Sawyer kills Locke's father.

In the season's third-best episode, ''The Brig,'' the castaway con man finally came face to face with the crook who doomed his parents. As Anthony Cooper baited and taunted Sawyer, we felt competing emotions: Kill him! Don't kill him! Exact some vengeance! Extend some forgiveness! In the end, Sawyer choked Cooper to death using the Black Rock's slave chains. You can debate the symbolism.