I caught Kerry in a Sodium Attack (Na3 opening move). Seriously, though, Kerry Shirts is the best opponent to practice openings on. :) Chess is a fun game to play, once understand the fact that it's just a game to practice strategy.
It's not a waste of time to practice Chess. There are many openings and mid-games that can progress from the game and can teach you many things. The reason why I practice openings on Kerry Shirts is because he doesn't really sit back and ridicule your openings. I believe that all openings can lead to checkmate of your opponent's king. I proved that I can defeat Napoleon's Opening in the last three Napoleon's Opening games I've played.