You know how sometimes you'll get a song stuck in your head, but you can't remember all the words? And you know how some people say a particular word or phrase in such a distinctive manner that you know it has to be them?
Well, combine the two. Right now I've got the same phrase running through my head over and over in a very particular way. I can hear it in my mind clear as day and I know that some friend of mine says it just that way. I just can't remember who!
It's driving me crazy! (Or driving me sane, depending on your view of where I was before.)