Cobleskill
Treehouser
Git yourself an electric fly swatter. Harbor Freight. $5. Make sure it is the D cell model. You can trap them against a window and avoid splattering fly guts everywhere, and catch them in mid air. If you leave it charged on a flat surface they will sometimes land on it. I have 2 and love them. Good for mosquitos, moths, hornets, whatever flies.
Funny for stupid people as well. Neighbor woman touched it as she was saying how does this work. EEEEEEEE she said. My friend shocked himself with his twice and then gave it to me.