Technophrenic
Technophrenic is the Schizophrenic behavior of people who appear to be talking to themselves, but are really using a Bluetooth earpiece to talk to their stockbroker, friend, fellow work, ex-wife, dog, children, podiatrist, or anyone else who will stay on the line with them while they roam about doing God only knows what.
He ain't crazy, he's only Technophrenic. See the Bluetooth in his ear. He's yelling at his {Insert choice here}.