Walking through the house, towards the front door. You are with me. We have done this same sequence before. But this time the people following us are closing in, and I don’t want to wait till the correct moment: A deer is pissing on the front walk. It has to finish what it’s doing. (Was it piss, turn around, and die? I can’t remember for sure.) So I open the front door too soon. So we can get away. And I open the front door, and I stop, stunned, terrified, simply by the deer pissing, the unfinished sequence, and the late hour of the dark night. I turn to you and say, “The thing about these simulations is, if they’re not perfect, they don’t work.”