I just went out on the front porch to change some light bulbs, and Sophia looked out the front door and said, "Careful, Daddy! It's dark outside!" After the first part, I was expecting some lecture on how it's dangerous to touch light bulbs or to stand on a chair, but she was concerned about the lack of light (which was what I was out there to remedy).
A minute or so later, as I was screwing the cover back on, she looked out again and said, "Careful, Daddy! It's cold and dark and yellow and red outside. And it's green outside too!" Maybe we should put a sign up warning people about the dangerous colors lurking about outside our house.