As writers, we all have passages that disturb us. Things we've written that chronicle the darkness in our own soul. Sometimes we hide these things. Sometimes we share them.
The characters whose argument gets violent.
The sex scene that turns intense in a non-standard way.
Yes, I feel one of these coming.
Some writers write it as a purge and shove it in a drawer. Mine usually end up as pivotal parts of my dénouement.