That must be a riot! Do they bust up like little "Japanese Zeros Over the Pacific"??
I talked to a guy at the gun club a long time ago who was into completion air rifle shooting. He told me that in the summertime he would take a paper target and lightly spray it with a orange juice mixture, tack it up, and shoot the flies when they would land on the target at 15 yards or so. He said they would leave a nice grease stain on the paper when you hit them square on!