On the 28 August 2012 @ approx 2130 hrs I was sitting in my back yard in the east end of Hamilton when I observed (two) what looked light orange coloured orbs. They were the size of a star travelling in a North to South direction. They had no aircraft markings or anti collision lights there were no contrails or sound coming from these objects. They travelled parallel to each other then closed in on one other, one then circled around the other then moved away at that point a flash of light like a static electric spark came between them. These objects kept travelling towards the south where I lost sight over the neighbours trees. Directions - North to south Weather- clear sky, light to moderate wind, moon was out. Descriptors-did not look like or have any characteristics of any aircraft, helicopter or satellite that I have ever heard or seen.