Laying on my back looking at the stars when one shot across the sky, did a 90 degree turn without slowing and stopped...then a second one did the same manuevere.

Got witnesses outside....this was repeated four or five times. 
These lights, of course, were not stars. The lights were very, very high in the sky on a night that the stars were all out.  They made a pattern like a tic-tac-to pattern. The 90n degree turns without slowing is what was really impressive.  
I'll never forget it, but have not told the story all this time for fear of ridicule.