"Hey honey, did you know that cavemen were actually much more intelligent than people think?"

Since Tom is always bringing me new and odd and interesting bits of information, I perked up a bit, curious - and praying like anything this wasn't a lead-up to a reference to the stupid Geico cavemen. "Really?"

"Yeah. When they went hunting, and used spears--" here he gestured, holding an imaginary spear up to the side of his head, shaking it, "--they were the first ones to develop shake spears."