Grey blob hovered over me

I was standing in our alley smoking a cigarette and looking up at the moon. I turned to ubserve the rest of the sky when I noticed a dark shadow slowly moving from west to east. Immediately I thought I was just seeing things. I thought that maybe the bright moon had burned a spot in my eyes, so I kept trying to use my peripheral vision to see if it was really there. It slowly drifted across the sky and I thought maybe it was a single tiny cloud. After about 30 seconds of staring at it trying to rationalize what I was seeing, it stopped. It was almost right over me, maybe a few degrees to the south. It started bouncing around and moving erratically. It appeared to have noticed I was looking at it and started moving all around to see if I really could see it or not. Well it had me spinning around in circles trying to follow its movement until it came really close right over the top of me. That's when I was a little frightened and I stepped into our car port out of natural instinct to find cover. It then moved north west and broke the line of sight, I walked up the alley until I could see it again and it came right back over the top of me. I gave it a little friendly wave and smile and raised up really high and zipped off at high speed to the east in its original direction of travel from when I first spotted it. I stood there for several minutes stunned and amazed, questioning what in the world just happened. I have no idea how big it was or how close it was as it appeared to me as a grey sphere with a small grey ring around it. Also when it zipped off at high speed there was a small streak of light.