I heard a weird sound like a pulsating hum. thought it was coming from power substation across the street. concerned i went to look. i opened my front door and heard it above the house looked up and there it was. it had a set of 4 lights in sets of 2. 2 in front 2 behind those. one on each rear area and one big red blinking light. out line was clearly visable and shapes see lights lit up underside. was was very unique shape if seen again could identify. but i have never seen anything like this. and it flickered 3 times and disappeared.