I think you were probably seeing a launch vehicle (rocket) tumbling around in low orbit, presenting different parts of itself to the sunshine as it tumbled. I've observed many of those over the years. They indeed appear to be jerking around as they move.
That is the best explanation I've heard so far--
My cuz Wick says it was all that tequila... I drink while fishing that made me see the thing juke about.
I do, however, believe there are some true unintelligent beings out and about--
Such as... Charlie Waffles!
Now playing on CBS!