Back when I was a student, it wasn’t always easy for me to get in the mood to study. However, sometimes, when I felt I was finally really getting in the flow, my Troll Brain suddenly remembered that one annoying tune that kept creeping around in my head for ages once it had got started and the more I fought it, the worse it would get. Consequently, in the end I would just give up and let my   Troll Brain pursue his hobby of being a DJ.