Intelligence?
Lol, lived in Scotland until I was 8, moving to Louisville in 74. My soccer team in Scotland wore the same shade of blue and were dominant in their sport.
4 years after moving here I saw my first basketball game on TV when we beat Duke in 78. They wore blue, I now lived in Kentucky and I'm a loyal guy. Stick with the team I pick. Also basketball has many subtle similarities to soccer so I understood it quicker.
That game got me listening to Cawood and buying in which led me to hearing the Reds dominating with Joe and Marty calling the games which then led me to hearing the Steelers win two Super Bowls.
So other than the Reds, which have their own place in history not quite equal to the other three, I picked the three most successful teams in their sport with the most obsessive and loyal fanbases mostly in that two year period between 78 and 80.
And... If you think UK vs the dirty birds is an intense rivalry, Google Rangers vs Celtic. Nothing like almost 1000 years of religious hatred to ramp things up a wee bit, I tell ya!