For as long as I can remember, the bulk of my grandparents' conversations with each other sounded like the arguments between R2 and 3PO - they've even pointed it out themselves on occasion. I remember back in the early '80s, my grandma who is 4'11" used to wear a windbreaker all the time, and once she put up the hood while we were going to dinner... my grandpa saw this and called her "E.T." for like 6 months after that, she didn't find this particularly funny so she'd get all bitter and bicker with him about it which would lead to arguing over other stuff with that same sort of banter and name-calling as our favorite droid duo.
So are my grandparents the only ones out there like this? Somehow, I doubt it.