Color by numbers is a children's activity meant to build confidence and teach basic organizational skills—follow the legend, match colors to numbers, and create a picture without needing artistic talent. The medium is inherently forgiving and democratic. Even a child with no artistic ability can produce something that vaguely resembles the intended image. The markers are usually bright and primary-colored, designed to be cheerful and non-threatening.

Then this fact introduces a grotesque image: Chuck Norris's markers filled with blood, unable to complete even this simplest creative task because he's running out of colors. The constraint isn't artistic—it's logistical. He's eliminated so many victims that all that remains in his toolkit is variations of red. The fact works through specificity and darkness: it's not abstract violence, it's the mundane problem of a murderer with a limited palette.

What's brilliant here is the way the joke acknowledges a truth hidden inside the absurdity. The color red—blood red—dominates Chuck Norris's life in the meme canon because that's the only color that matters in a world he's descended upon. Diversified color ranges are for people with normal priorities. He has only one concern, which means only one color is relevant. The punchline about darkness being monochromatic is bleak and perfect.