You’ll notice how, when walking down the street, you’ll sometimes find yourself facing someone going in the opposite direction, and each of you is blocking the other, and when you move to the left, the other person . . . moves to the right, and vice versa, and after you’ve done this, say, twice, it’s almost impossible not to do it, and now you’re having far more interaction with this other person than you really want to have, and you’re both looking at each other all apologetic and embarrassed. It is an awkward impasse.