practicing responding to the stranger who randomly joined our conversation at the bar

Yeah, so a philosophical zombie is somebody who behaves like a normal human, they can walk around and have a conversation and react normally to stuff, but they're not conscious. Which means something like, they don't have subjective experience. What is subjective experience? One way it's defined is being able to experience "qualia". Like, if you look at this brick wall, it's red. From a physical perspective you can analyze this as like, it looks red to you because it's light of a specific wavelength that travels into your eyes and activates cells that send neurotransmitters that signal other neurons in your brain and so on. But you probably have this feeling, this experience, of what it's like to see red that doesn't feel to you like it's "light of a specific wavelength", right? That experience is qualia, and it's part of a definition of consciousness, maybe. There's an old thought experiment that John Locke came up with that was like, imagine that everything in the world that looked…