UFO Sighting in Crockett, Texas

I saw a white light slightly strobing and very bright. i thought it was a star at first but then it began to flicker slightly and there was no cloud cover to cause that. then it began slowly moving forward steadily. it then stopped still and began to zig zag across the sky very fast. then it stopped abruptly and took off in the blink of an eye. it moved so fast it could not be earthly. it would have to have been traveling thousands of miles an hour, and the angles it turned at were hard 90 degree turns.