“The man who mistook his life for a hat” (or “a hat for his life”). I like that one.

or just (not so good, unless you can work a pun into it).

“Talking through my hat”

Alternatively, suggestions:

“You know it makes sense sometimes.”

“I don’t blog about unknown unknowns” or “Blogging about known unknowns.”

“Weltanschauung is a very long word.”

“Weltanschauung: a comprehensive conception of the world from a specific standpoint.”

“Weltanschauung: in this case, my opinion.”