I've tried to mentally retrace my steps. It's a similar feeling to looking for where I've misplaced my phone. There are a limited number of areas that it could be, and I've searched all of the places that I can recall, but I know that I must be missing something because I haven't found it.
I had a couple of other post possibilities that I had been thinking of when this forgotten one popped in my head. However, the nagging feeling of missing something is overriding the concentration necessary to give one of them the attention it deserves--the other topic is kind of a filler that I'm not that enthused about anyway. Thus, I decided to write about the missing post rather than the ones I remember.
Argh! I can feel the shape of it, like its shadow is here, but every time I try to look for that shadow's source, I lose track of it again. Now I'm also concerned that when I figure it out (if I figure it out), I will end up being disappointed as it will turn out not to be worth the effort that I'm spending on trying to remember it (which is likely). Still, this is going to bother me until I figure it out.