Just tell folks that you ran into a crazed blood doctor (I forget the technical term, lol. I should remember, considering how many times I've had my blood taken.)

We have spiders, too, although I don't know how they survive with all our "hitmen" in the house. I just ignore them, though. A 'I don't bother you, you don't bother me' kind of deal.

My laptop screen will sometimes do that, too. I just restart it or put it into hibernate and that tends to fix it. I'm not sure why it does it, unless it gets overheated or something. *shrugs*