Music and life, especially the second one. I found I need to avoid relying too much on TV, (like my fav, Supernatural), movies or books, because then my stuff just feels too derivative.
It's the "what if's" that drive me. I try to ask them every second of my life. When I'm driving home alone on a highway, stop at a lonely gas station and it seems like I'm the only one alive in the world, I ask "what if?" When my three year old daughter is afraid of a monster hiding under the bed, I ask..."What if?"

