This video of a triangular UFO over Amsterdam was filmed on October 28, 2013, but its author posted it online just the other day.
The white triangle soars smoothly in the sky among the clouds, making slow turns and practically standing still. Therefore, at first glance it may seem that this is just some paper or plastic bag blown into the sky.
However, at the very end, this object does such that it immediately becomes clear that this is not garbage, not a kite or a drone. In a fraction of a second, the object seems to explode with a bright yellow flash and disappear at great speed, making a dash to the left.
According to the author of the video, this may not be an alien ship, but the very secret American triangular plane TR3B, which is rumored to be built on the basis of the technology of the UFO shot down in Roswell.
However, hardly anyone would launch TR3B in broad daylight over such a large city as Amsterdam.