Three pinpoints of light flying in unison, then making extremely fast erratic movements, before flying in unison again.three rather dim pinpoints of light the size of distant stars or satellites were moving across the sky in my direction in unison. they seemed very far away (maybe higher than a commercial jet flies). As they approached the point of being directly overhead, they began to dart in different directions, like fire-flies buzzing around each other while at the same time, maintaining their general course (west, south-west to east, north/east. The amount of distance they were covering in such short time with each swerve and the erratic changes in directions struck me as impossible for any aircraft I know. They were too small, too far away and flying in too coordinated a manner to be insects or birds (and the quality of light looked exactly like a star). The objects seemed to accelerate in the general direction they had been traveling to begin with, as if they were again flying in a more unison and coordinated fashion. At this point they flew over the roof of my house and I was unable to find them afterward.