The flies must have a nest or birth place near here. I opened the front door and four flew in. I noticed two flying together in unison and then two appeared to be kissing and one crawled on top. One fly was upside down in back of the toilet, one on the ceiling looking down. One fly tangled itself in my uncombed hair. Then after a few days they starting dying all over the house. One fly I found dead on the bathroom floor, another fly died in the soap dish, still another appeared as if sleeping in front of the sewing machine.