strange turquoise light over Portugal sea on sunday night.On 22MAR09, around the 2245 GMT, Sintra - Portugal, I was on my backyard watching the sky over the sea. Lots of commercial planes flew that time and we are able to see it. Then I saw some strange light turquoise with a similar oval shape, moving too fast and making strange trajectories. I thought that could be military airplanes, since I live near the air force academy. But then I saw something real strange, the light had become stationary about 15 seconds, and then I make some things real strange. First I had make it circular maneuvers and the I saw the light flipping several times and then a real big noise, like the plane breaking the sound barrier. And the UFO just vanished in black sky. The UFO could not be very high, because has clowns in that night. Normal the commercial planes I can see the shape, even some times I can see what company they belong. This was strange. Too bad I didn’t have any recording machine available at that time it would be interesting. Any way I saw films about some maneuvers that modern aircraft can do, but Portugal doesn’t have that planes, the only modern planes they have is the F-16 and Dassault Alpha-Jet.((NUFORC Note: Witness elects to remain totally anonymous; provides no contact information. PD))