Any time a writer thinks he has all the answers to how someone should talk or react or end a scene, it's a spontaneity-killer.
I was a product of a divorced family and I used humor as a weapon to combat sadness. I used comedy to make my mother laugh in light of the darkness that she faced, and to me it became a very powerful tool at a very young age, at six. I saw how therapeutic it could be.
That was when the Spanish came in and conquered the Aztecs. I thought that was a clever thing.