Mystery Unmarked Black Jet flys Low Altitude Toronto 07/13/09

Practically right outside my front window I witnessed this blackish grey unmarked jetliner do a fly-by virtually no more then 200 ft above my neighbourhood. To add to this the jetplane had no marker lights flashing, no logo or insignia and the most important fact of them all is the issue of this plane travelling above not much higher then a 5 story building. Simply strange considering that our main airport Pearson Airport in Toronto is clear across the city in the other direction. Even more bizzare is this mysterious jet seemed to go unnoticed by many pedestrians and drivers.