I hate to say this about bluetooth....but at times, I have crossed the street or gotten in a different check out lane thinking 'that person is talking to themselves'.

I know, eventually we will all have a bluetooth surgically implanted, including in our dog's ears....'my little putsy wootsy, did you pee on the paper?"

I lived in the era of eye contact and body language. With all it's implications. and last but not least.