Always bring your camera with you.
I just happened to be traveling by car out in the Joshua Tree desert and saw a lot of cars parked off of the freeway off ramp so I pulled off too. They said the final flight of the Space Shuttle Endeavor will be flying over soon. So I got my camera ready and within a few minutes the Endeavor flew by and I got my shot. The background with the clouds and moon have been manipulated in Photoshop.