Four white-yellow lights moving across the sky over Lake Michigan at incredibly fast speeds.Walking to a beach on Lake Michigan, my companion and I watched as four white-yellow lights flew across the sky. At first we believed them to be at the bottom of some aircraft, but it was zipping across the night sky at a relatively quick pace. The lights had a southbound direction. At some point, the lights moved in such as way that the imaginary craft they were connected to was no longer parallel with the earth (horizontally aligned) but as if it were perpendicular to the earth (vertically aligned). The lights then converged together. They began to corkscrew rapid in the night sky before flying off in that corkscrew fashion in a southeastern direction.