| I remember seeing a video of three of these over Belgium on the news when I was about ten years old.  Back then, I was naive, believed fully in alien visitation, and (promise you won't laugh too hard) had a horrible fear of alien abduction.  I could barely sleep for a week after seeing that.  
 Eleven years later, I'm more inclined to believe the stealth blimp theory.  BTW, it uses small lights and almost entirely non-reflective paint to blend in with the sky, it's not really radar-invisible.
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