Say two guys run into each other on the street. They're both members of a fraternity, say... Alpha Fido. Guy A is from Cool State and Guy B is from Cool State's rival school, Badass U. [Edit to add: The schools are big college football rivals. As in, football is srs bznss, huge thing.]
Would the two guys be friendly because they're both Alpha Fido brothers? Or would they be hatin' because they're from rival schools? WHERE DOES THE LOYALTY LIE?
These things, they keep me up at night.