The 'caveman' in question is actually a Sacramento, California resident by the name of Jeffery Allen Jones. He does look a bit Cro-Magnon.
Mr. Jones was arrested for acting like a caveman. Here's what that entails:
Mr. Jones, being a caveman, was obviously frightened by the motorized vehicles whizzing past him so he took to throwing his spear at them. Caveman finally hit a passing car with one spear and it became lodged in the front fender of his target. No one was injured and Jones was arrested after a brief search.
I'm thinking there was some profiling going on here. Cops probably just went out and nabbed the first caveman they saw.
We don't know whether or not the driver had Geico insurance.