Red and blue lights in California seen moving fast in strait lines and slighly changing course.I just saw two UFO's. Night, Sept 10th, 2015, at approx. 8:15 pm, Antioch, CA. A red, round light and a blue, round light traveling directly east, from west. I thought they were Mylar balloons at first, about 50 feet up, but traveling too fast and strait and the wind is coming more from the north/north west. Then I thought “birds?” I thought they were balloons reflecting light from the street lamp. I soon realized (about 1 second after they came out from behind my tree and about 3 seconds after first sight) they were not balloons or birds, as they had their own light source. Then the red one changed coarse slightly but both kept moving quickly to the east in very strait paths. When the red one changed course for a moment it seemed to be a very precise, yet playful movement. They crossed overhead and out of sight towards the horizon in Antioch in about 10 to 12 seconds (total sighting including tree obstruction for 2 seconds). They made no sound (that I could hear). I was not sure how high up they were, so also not sure how big, but given the minimum distance they moved, they seemed to be going fast. They seem to fade away before reaching a normal distance of low visibility and while still above the horizon impediments. The sky is clear. My neighbors are almost always on their front porch so I went across the street and asked them and one of them saw it too. They exploded in a flurry of slightly intoxicated explanation and agreement that one of them had just mentioned it, saying, “I guess you’re not seeing things.” The girl saw it as it was already well past the zenith and closer to the horizon. She also said she only saw a blue one, which I thought was strange because they were only a few degrees apart after going into the distance, but that was from my line of sight, which should not have been much different than hers. Maybe the red one faded out before the blue one, I do not recall. It seemed to go one or two miles in! about 13 seconds, but that is guessing that it was as big as a house and about 600 to 1200 feet up. It may have been 200 feet high, very hard to judge. It looked about the size of a 20 inch balloon just above the telephone pole. It was exciting. So exciting, it may have happened in 6 or 7 seconds and just seemed like 10 or 12 seconds.