Psychologists call it the cocktail party phenomenon. (Psychologists, it appears, have learned the value of memorable packaging, too.) You've experienced the cocktail party phenomenon. It works like this:
You're listening to someone at a cocktail party. Suddenly, you hear your name mentioned in a nearby conversation. Now you can hear that conversation, but you no longer hear the one in which you were involved.
This happens because people cannot process two conversations at once. If you deliver two messages, most people will process just one of them - if that.
Morale of the story : Say one thing.