These robots are literally inhuman, and yet I react no differently to their stumblings and topplings than I would to the pratfalls of a fellow human. I don’t imagine I would laugh at the spectacle of a toaster falling out of an SUV, or a semiautomatic rifle pitching over sideways from an upright position, but there is something about these machines, their human form, with which it is possible to identify sufficiently to make their falling deeply, horribly funny.