2 large silver craft, rotating above us. Changed shape rapidly, and disapered into the darkness in a burst of light.

The sun was going down, the moon coming over the horizon. My friend was in from California, and we had just finished dinner. We decided to go out and have a cigarette and watch the sun go down. My friend said he heard thunder, but I said that was impossible, but I looked to the sky anyway. A brilliant flash of light knocked us both to the ground, and we looked up,  covered our eyes because of the light, and saw to rotating silver  craft. They changed shape rapidly to what looked like a giant black triangle. The first craft emitted a beam that lifted a 40 foot cactus out of the ground and fix the sand so the earth looked untouched. We then heard a deafening roar which we both assumed was the craft communicating with each other, they then both exploded into a brilliant display of colored light, and in the same way they came they were gone. My friend got up, lit another smoke, and said "Well Rick, this is really one for the books". I have since moved to New York because I just got to thinking that too many of these UFO sightings take place in the desert. I still keep in contact with my friend, and this always come up in conversation.