There was one interesting group in my lane at the store today. They consisted of five oriental men and women, all of whom were deaf. They had no problem communicating with each other, of course, but I have no knowledge of sign language, and there was a question on the price of one of the items being bought.
The "leader" of the group finally suggested that he and I communicate in writing. I felt like such a dork, not thinking of this myself, since I always have a pen and notepad with me.
All ended happily, of course. It's amazing how much can be conveyed with body language and a positive attitude. And these guys (and gals) were good.