Fathers and sons are natural enemies. Look at any species. Shark, sees his father in the water, he's not thinking, "Hey dad, wassup ?" He's thinking, "Back off, old man, this surfer carcass is mine." Of course, when his girlfriend swims up and she's like, "Way, you know, there's enough surfer for everybody. You and your dad need to frenzy together more. Leave you father a thigh."