All the early arrivals sat at the ends of the rows, leaving massive gaps of empty seats in the middle, meaning that those who arrived later, had to really squeeze past the knees and backs of heads at the start of the rows. It's just a little thing, but kind of reminds me of the whole "Please move to the back of the bus" phenomenon. It's not that these people were thoughtless, or particularly ill-mannered, but until they were squished past, they probably really just didn't think too much about it. Yes, of course, the latecomers shouldn't have been late, but many of them probably had a very good reason, and felt stressed and anxious about it, so making them squeeze through people, rather than falling gratefully into a chair close to the door, wouldn't have made them happy.
Today, I'm going to do something to make three people feel happy. I'm not sure who, or how I'm going to do it, but I'll do it. You?