It was well over 20 years ago, but I will never forget how unusual it seemed to me. I still don't know just WHAT it was, maybe you can tell me what you think.

A friend and I were looking up in the sky and saw a small(seemed to be very, very far away) horizontal line. It was very high above the horizon, almost straight over head, but now quite.  Anyway, as we watched it, it made several moves like this....straight up,stop, right angle move to the left,stop; straight down, a 45 degree angle to the left, and so on. 
In between these movements, it would stop at a complete stand still, then procede with its moves.  Then all of a sudden, it moved very quickly in a 45 degree angle and disappeared. That was it
Date is approximate.  Source does not indicate location of sighting.  PD