I will now tell you all a true story from my life. It is about an individual whom I have the pleasure of knowing.
My boss's secretary, whenever he walks into any room, greets everyone in it with a loud "YES!".
1. It is a single "YES!" and it is meant universally for everyone in the room, whoever they may be (including my boss).
2. Till date, he has never said "Good morning" or "Hi" or "Hello". Just "YES!"