Because we invented the sport and had to play each other before the rest of the world got involved.
Tottenham vs. Arsenal (02/03)
El Clasico Mate (02/03)
Merseyside derby (03/03)
Milan derby (17/03)
Some random game John Arne will post about (??/??)
That Mitchell & Webb video must be over a decade old, Webly, you arse.
Some other derby nobody cares about
Because we invented the sport and had to play each other before the rest of the world got involved.