I think I get some of my best photos during spontaneous shoots.
Take these for example: I was driving home from a basketball game with my brother late one night in February, and we decided to take a detour through the city. I have a habit of going out of my way to drive through Pittsburgh, (I honestly can't get enough of the 412) but I never have a subject with me as I'm often going to or coming from work.
So despite the frigid temperature, we parked and spent a half hour getting some of my favorite North Shore shots to date. Luke was a total trooper - he just so happened to be wearing his Starling Marte shirt, and was willing to practically freeze while I directed him to look this way and that way and the other way.