A disc shaped craft, approximately thirty feet in diameter, hovered silently roof level.

My two sons and I stood in awe on our front porch as a disc shaped craft, approximately thirty feet in diameter, hovered silently roof level at the intersection of two cross streets --- just feet from where we stood. 
The laser-like lights on the craft struck the street below.  
As I began to think this is not possible, the craft slowly gyrated in place as if to show all aspects of itself. 
As I looked up and down the street I thought the lack of cars on the road was equally bizarre. 
The craft then slowly and silently floated down the street parallel to the street.  
The craft stopped momentarily at the end of the street and then instantaneously propelled into the southeastern sky at speeds that defy modern physics.
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