It's on the tip of my tongue…

How often has this happened to you?

"So I was talking to…to…oh, you know, that guy, the one in the head office, big hair, bad teeth, only listens to Perry Como records…geez, why can't I remember his name? It's on the tip of my tongue!"

It's a common phenomenon, and it's not just people's names. Sometimes you can't think of the name of a place, or a food, or a car, or…just about anything. You can feel that the information is in your head, but you can't shape it into a word.

It may be a...