"It's a moment early in the film when Gollum, the shriveled little creature leading Sam and Frodo to Mordor, talks to himself while contemplating his reflection in a stream. Again, though the scene is a technical marvel, it's not the special effects that grabbed me. It's not even the nature of the conversation Gollum has with himself — a tortured exchange pitting whatever shred of goodness is left in him against the grotesque he has become in the wake of his obsession with the ring of the trilogy's title.
No, what continues to haunt me about that scene has less to do with what happens on the screen as with what happened in the theater.
In the screening I attended, packed to the very worst seat in the house, there was no shortage of laughter as this pathetic character, physically and emotionally destroyed by his lust for his 'precious,' sinks into complete and hopeless depravity. It is a heart-wrenching, desperate moment, painfully familiar to those of us who know how it feels to be simultaneously enticed by sin and aware that it distorts us on the inside every bit as much as it distorts Gollum on the outside."

I am a sinner. I'd expect we all are.