Fly in the butt.

These things irritate me at the best of times, so when I came home from work and went on the computer to do a bit of work, this big fly REALLY got on my nerves. It flew around my den, bouncing off the windows, dive bombing me, and I was chasing it around like a man possesed. I took this photo just after I had stunned it, just before I went in for the kill!