Z and I had this conversation last night after I tucked her and A into bed.
Z: Dad, what if your eyes never got used to the darkness and when you turned out the lights you couldn't see anything at all?
Me: Use your hands to "see."
Z: What if I was feeling around in the dark and I felt something furry?
Me: You should pet it because it is a cat.
Z: What if it is a wild animal?
Me: You should kick it. Because it is a cat.
Z: What if it is a giant wolf?
Me: Then you are outside. If it is so dark that you can't see except with your hands, just stay inside.