I remember in high school my friend “Joe Bob” wore a shirt that he silk screened. I could tell it said something but I couldn’t tell what, because the letters were artistically skewed and jumbled. “What’s you shirt say, Joe Bob?,” I asked. “Suck.” I never got an explanation.
So to me, since cave men represent the randomness, potential, and folly of humanity, I felt like invoking Joe Bob’s incongruity. Unlike Joe Bob, I will explain why these drawings say suck: it would suck to be a cave man.