You're right about that. At it's inception, the Bluetooth company's slogan was...
Bluetooth: "Keeping you and your personalties...connected."
Hold on, I'm getting a call...
...yes?
...
Oh, hey zan'b'anjos. No, I'm busy right now. Wait a sec', I gotta put you on hold...I have another call...
...
...Oh, hey zan'c'anjos, I'm on the phone with...that's right! How did you know?!
That's what I've actually thought every single time. Then I have to remind myself that they probably have one of those in their ear. I can barely tell they're there at first though!
yeah...sometimes....what really gets me is when they will be talking on the phone, and looking directly at me...i have often mistaken, a "hi", or "how are you doing?" for the person on the other end as being for me and answered, and then get stupid look from the person.