I just had that occasion over the weekend while getting a tire repaired. I saw a woman waiting and the face registered as someone I had known in the past but the name escaped me. I had a book to read while I was waiting and I guess I found that much more appealing than trying to think of something to say to her. So I ignorred her and read my book. She moved over closer to me in the waiting area but didn't say anything. I have this thing where I figure it's really THEIR move since it's THEIR stupid rules that put up the barrier in the first place. I'd have talked to her if she'd have said something.