All afternoon I kept getting this flickering in my peripheral vision.  Early on in my pregnancy I had some dizzy spells with floating light motes and had to put my head down to recover.  I wondered if I was developing some kind of late pregnancy condition.  Of course I was too busy to stop and worry about it.  Then I moved over to my table to review some files.  The flickering got worse.  As I looked up one of the flourescent tubes blew out.  Duh.  I may be sitting mostly in the dark right now but at least it's not a seizure.