Long Exposure (Of course, this is for subjects that you still use! For myself, this subject is linear algebra. I was pretty confused about it when I first learned the subject, but ever-so-slowly, I've become much better at it. What subject is this for you?)
Partitioning Skills (You know things are bad when you're deep in the obsession phase for a story but you start mixing in characters and plot elements from the other book you're reading.)
Compactify (Unfortunately, we often present mathematics in the opposite order, where we show the nice and tidy formula which only makes sense to someone with a lot of experience and intuition on the subject.)
Bankruptcy (Who am I kidding: I sometimes get nervous about deleting anything, and so I just let the list languish. Sometimes, I switch to new services to achieve the same effect!)