It happens most often at doors and four-way stops.
Husband tried to go to the post office today, got up to the door and there was a guy on the other side about to come out.
Both men waited the required awkward 30 seconds. The inside guy then stepped forward and pushed the door open.
Then the obligatory apologies: "Sorry, I thought you were coming through first." and the reply, "It's ok, I'm not in a hurry today."