Unusual light movement in night sky

I am reporting this on a behalf of a friend. The reason why he does not want to report it is because he is skeptical of aerial phenomenon but I thought it was woth reporting it if he wasn't going to. My friend was at a men's retreat in a upper Wisconsin area, very far north. 
He said him and about two others were enjoying the summer evening when they saw a light far away up in the night sky.  He said when he first noticed it he figured it was a satellite.  But then he realized it was moving faster than a satellite and moved at sharp and random horizontal, vertical and angled paths. "Kind of zig-zaggy" is the term I think he used. I don't recall if he said the lights were colored or not.  He just noticed the unusual movement.
 (P.S. Regarding the report a UFO over at O'Hare International in Chicago on Nov. 7, 2006. I've known several people who work at the airport on the ramps, maintence, etc, and I find them to be people who would not make something up as controversial as a UFO sighting in restricted airspace, especially n this era of heightened airport security and the Patriot Act, it impresses even more.  My feeling is that these people must have seen something significant or they wouldn't have stuck their necks out as they did to report it.)