This is also a useful technique for keeping two people in sync about something situational and important. Whenever our pet bird flies down to the floor, which is often, it's vulnerable to being trodden on. So the wife and I call it out whenever we see it, and repeat until the other person also says it out loud.

Works with lots of other stuff, like hot stove tops. It can be a bit infantilizing to the other party unless they're also au fait and on-board with the technique.