Oh come now! We ALL have voices in our head! Don't we?!?!
Some of us do.
From the Compleat Idiot's Guide to the INTJ:
DON’T engage us in “small talk”. Keep in mind that you are competing for our attention with all the voices in our heads, and they are bound to be far more interesting than you. The voices are constantly regaling us with things like anagrams of Wayne Newton (Wanton Weeny, We Annoy Newt, New Yawn Tone, …) and candidate titles for parodies of “Carry On My Wayward Son” (“Cary Grant Was Six Foot One”, “Curry On My Egg Foo Yung”, …). Do you really think your talk of the weather or your six year old’s soccer league is going to be more compelling than that? Please. Be realistic.