And by "I had a visitor" I of course mean "evil incarnate materialized within my house and tried to chew off my head and suck out my soul through my bone marrow" but that's kind of a given, right?
Here is a picture.
So, after a few moments the soldier of Satan disappeared so I very cautiously came back into the living room and sat down, at which point I heard the accursed thing buzzing rather angrily behind me. I hoped that it would be stuck behind the curtain for a few minutes at least, and resumed nibbling on my delicious (yet by this point room temperature) sandwich. At which point it appeared from behind the curtain, about half a foot from my face, and tried to eat me again.
After hiding in the kitchen and swearing some more, I ripped up a piece of cardboard and through several minutes of frantic curtain-slapping and horrified banshee cries, I managed to trap the thing in between our glass sliding door and the screen door behind it, and even got the screen door open a bit so it could find its way outside, which it eventually did.
Hopefully when it gets back to its nest of terror-beasts it will remember my benevolence and not the fact that I, y'know, was shrieking and swearing at it for a good half hour and swatting at it with a strip of cardboard.
Oh also, I managed to twist my neck funny trying to watch my assailant, and I had this excruciating pain between my shoulder blade for a little while. But I think my bones have re-settled back to their original positions so that's nice.