Very fast moving alternating zig, zag strobe lights over Key Largo, FlOn Wednesday night 8/5/15 I was coming back from my walk. It was about 9:00 p.m. and had just gotten totally dark.I was turning the corner from the bike/jogging path along the main highway into my subdivision. I was walking south when I looked up saw this light. It was red, white and blue and blinking like a strobe light. It was moving quite fast to the east towards the Atlantic Ocean. I'm right under one of the flight paths to Miami International Airport, so I see blinking lights all the time. This light seemed to be moving much too fast for an aircraft. This was different. I thought must be a plane but why is it moving so fast??? It didn't make any noise and I couldn't tell how high up it was and thought.. Drone??? The lights pulsed and flashed like a strobe light. I walked as fast as I could nearing my street which faces east trying to keep an eye on it.It was moving east and I couldn't keep up with it as it went behind the tree line. Then standing on my street I was able to catch this extremely fast moving light. It had turned now moving more northerly. The strobe lights had split into two sections one on the right, the other on the left going on/off alternately.What perplexed me was this was just a single multi color strobe was now two lights alternating and seemed very wide apart, I thought maybe a banking airplane and now I was able to see the lights on both wings. The lights jumped back and forth in a zigzag fashion. They weren't on a straight line of sight as one would see on aircraft wings. The strobes blinked in an 8 o'clock and 2 o'clock configuration and then changed to a 10 o'clock and 4 o'clock going back and forth. I only could see it a few more seconds before it was gone behind more trees.