I was visiting Dallas back in the '80s and went to see the botanic gardens. There were a lot of police and security personnel around, so we asked one what was up. He said the king and queen of Sweden were about to arrive. Thinking he must be making this up, we left and got on the freeway. Sure enough, here comes this motorcade headed in the opposite direction. I managed to turn around and snap one frame out the left rear window (I was in the front passenger seat). I was amazed that it came out as good as it did.