2 scientists, among 7 witnesses see disk hovering approximately 100 feet above neighbor's home then yard.

Sitting at picnic table at side of suburban (Pittsburgh) home under pine trees, group of us were startled when a high-intensity light shown down from above us. Even at age five, my reaction was "maybe police" (and perhaps one of the adults actually said something to that effect). 
My brother-in-law and I ran out from under the cover of the trees to see and over the house next door was a large disk hovering or slowly drifting with a humming sound.  It moved over our friend's back yard and shown its light down once again, taking off at a high rate of speed (faster than any jet I've seen). 
My "uncle" (parent's best friend) insisted that this event be recounted at his funeral in 2004 to make a point of his witnessing it.  He was an assiduously honest scientist who wanted the report to be made known.
Witness indicates that the date of the incident is approximate.  PD