a huge shadow appeared out of nowhere, revealing a enormous boomerang shaped object.

Lights On Object: Yes
my sighting took place in 1991, i was out side of my apartment complex it was about midsummer. i had just finished hanging out with my friend, when our mothers had called us in for dinner, my friend was the first one inside,  i then proceeded to go to my own apartment. i at the end of the walkway that lead to my apartment when out of nowhere a huge appeared, i looked up and saw a enormous boomerang shaped object as big as the apartment complex section that held my apartment and three others.probably about sixty feet long, it was all black and moved slowly in the way a boomerang would if one were thrown, it had towers of white, green, and yellow lights on, as i got to the end of the complex by my apartment but above our neighbors, seeing as mine was on the first floor,it shot straight up into the air and was gone in the blink of an eye, it was 6:00 pm when i saw it and when i went in side after it was gone it was 8:00 pm, my mother was very concerned as i was nowhere to be found for the space of 2 hours. where it only seemed as though i was looking at it for a few minutes it was 2 hours. i have no memory of the 2 hours of time other than seeing the object in flight then disappearing, as it was then and still is now, i have 2 hours of time completely absent from my memory. i have never seen another object like it again. the boomerang shaped object completely made no sound, other then a faint and distant humming noise, you could barely hear it at all.
Witness indicates that the date of the incident is approximate.  PD