oh, i forgot one time
it was at night on the road nearby the "pyramid mountain" of Rtanj in eastern Serbia
the light didn't do anything extremely unusual, it was just there, wandered around and then it disappeared
the area is famous for these sightnings, just look up Rtanj and UFO
the mountain itself, i climbed it all the way to the top... i got a distinct impression i was on an extremely weathered old pyramid, there was definitely corners to the mountain, and a relatively flat facet on each side