Neither of these are particularly unusual, but...
The place I've had the best response to my ebook device was in the waiting room of the place where I see my optometrist and shop for new glasses and/or pick up my contact lenses. (They are always busy and there is always a wait.) The ability to change the font size seems to be a big draw!
The place I'm seen most frequently with my Sony 700 is at McDonald's while waiting to pick up my daughter from some activity. I live too far away to drive all the way home from town only to go back again a short while later, and I actually look forward to those occasions with my Sony, something to drink and tucked away in a back booth. I've only had a couple questions, usually from crew members, probably because I give the appearance that I'm really enjoying my time (which I am) and don't want to be disturbed (which would not be the case... I really don't bite!)