People here drive on the left side of the road. This is surprisingly exhausting to watch, because you have to think backwards anytime they make a turn. Correspondingly, in societies where they drive this way (ie. London), pedestrians mirror the system. In Canada, we tend to stay to the right when we pass one another on the sidewalk. Here, they stay to the left. A friend was lectured by a local to stay to the correct side, which naturally is the left side.
What I've noticed is that when I pass a local, I've begun consciously moving to the left, as they do, to pass smoothly. But when I pass a student or a spouse, we all stay comfortably to the right. It's very strange, but also reassuring, like the tiniest slice of home.