If there’s a dead-cat world and an alive-cat world, this has implications for the observer, too, because the observer exists within the quantum system. You can’t stand apart, so you split, like an amoeba. So now there’s a you who is observing the dead cat, and another you who is observing the alive cat. The cat was singular, and now they are plural. The observer was singular, and now you are plural. You can’t interact and talk to your other yous, or even know about your other existences in other worlds, because you can’t remember . . .”