Two bright lites hovering approximately 30,000 feet,they almost collided then flew off in opposite directions.

It was about 9pm on a clear summer evening,no stars were visible at this time. I was standing in an open parking lot talking with some friends. I just happened to look up towards  the sky and suddenly two very bright lites appeared in the sky. Slowly they came towards eachother and seemed to stop momentarily,then the two objects zig zagged in opposite directions as if they were communicating. This lasted only seconds. Suddenly they sped off in opposite directions at a speed that was very fast,faster than anything I ever observed. I cannot estimate the hieght that these objects appeared,but I would say maybe between 25,000 and 40,000 feet. My freinds did not witness this it happened so fast. As I explained myself,they just laughed and made the remark that I was seeing things. But I know different,what I saw could not have from this world,it was most definitely a very strange occurence.