Glitches
We had a power cut at work today. It wasn't just us, either; the traffic lights outside weren't working. Probably some workmen drilled through a cable. Of course, in my line of work, not much work can be done when the power's out. It came back on again after a couple of hours, so the day wasn't a total loss.
My vision is acting up. When I move my eyes, I sometimes see horizontal lines, like the scanlines on a CRT television. They fade after a split second, and it doesn't happen all the time. I've been a bit tired and headachy today; it's probably all related.