Yeah, it's just mental noise. Do you ever think you're hearing voices as you drift off to sleep, misread something you saw briefly as saying something very different, or mistake someone in a crowd for someone you knew?

Our brains constantly seek patterns in a sea of stimuli, and sometimes they create meaning out of noise. (http://en.wikipedia.org/wiki/Pareidolia)

"We are all greater artists than we realize." -Nietzsche