According to the Laws of Holiday, Camera Obscured refers to the phenomenon of a useless photo being created when an oblivious tourist wanders into your shot...
Now, thanks to a nifty website and their even niftier Anti Tourist Software, you can delete these unwanted invaders from your holiday snaps after they're taken. Upload your images and use the anti tourist interface to zap him... or him... or her... or them until you're left with the shot you want...

...but why stop at unwanted tourists, if your relationship has soured since you holidayed then why not zap your partner too in the hopes that someday they'll invent the technology... to let you zap your new partner in.