We had these two Irish twins in our neighborhood growing up. Not the kind that were less than a year apart. They were twins, and they were Irish. They were also the biggest and strongest kids in the neighborhood, which meant they had to be on opposite teams when we made teams for football. The game always ended with them getting in a fight with each other. Once I tried to intervene, and learned there was no better way to unite them...in turning on me.
Like I said, I tried to intervene. Once.
Quick learner.