Imagine this - you are getting ready for some night photography. You pick a late time, grab the car and go to a location that is usually always empty! You set up your stuff, hit the shutter release and wait patiently for something like 25 seconds. And in this moment (!) a lonely car drives by :D
In this case, it was not actually so bad as the image turned out rather cool! Together with the mountains in the back as well as the nice cloud cover I am kinda glad I was interrupted, hehe.