Just as the stand-up comedy boom of the 1980s was fizzling out, comedian Rob Becker began his research into the oddities of human behavior. Do women carry a shopping gene? Do men have a territorial imperative when it comes to the remote? Becker took what he learned and wrote Defending the Caveman, an insightful, enlightening and hilarious two-hour monologue explaining the anthropological reasons for the quirks that occur in the male-female dynamic. He tried out the show on the road in the early '90s, including a long stint at the Addison Improv, and ended up taking Caveman to Broadway. He's now performed it for more than 2 million people in the United States and Canada, and there are offshoot productions on the boards in Iceland and South Africa. Clearly, he's on to something with a universal message. With every syllable polished, Becker's show returned to Dallas this spring for a double run at the Majestic, where it played to sold-out houses of couples (mostly) who laughed till they cried and repeatedly jabbed each other in the rib cage, whispering, "He's talking about yewwwww!"