What would you call this behavior?

Rick and I went to a restaurant for breakfast. The place was 4/5ths empty. The back seems a little chilly because it’s uncarpted. The front half seems warmer. All of the two- and four-person tables up front were taken. There were four open tables that could seat six (a two-person table pushed up against a four person table…all said tables could be broken down into smaller tables.) We went ahead and sat at the six person table closest to the salad bar (which we would not have done had the place been busy.) In the row behind me was an open six-person table, and in the row behind that was another open six-person table, all in the carpeted area. The rest of the restaurant had a BUNCH of open tables, two, four and six-seaters. Well…..about five minutes after after we sat down two guys came in and sat at the end of our table. We were separated only by one chair. I looked around, and not only were all the previously mentioned tables open, a couple of the four person tables around us had come open. It was a little weird…it was like they just decided to invite themselves to eat with us or something. They never said a word to us, either.

Would you find this odd?