Barcelona vs. Real Madrid. Manchester United vs. Liverpool. Boca Juniors vs. River Plate.
And now, you can add Rangers FC vs. Little Mix to the equation. No, seriously.
A bizarre Twitter feud has broken out between fans of the Scottish Premiership team and the British girl band thanks to the success of one Rangers chant.
The chant, a tribute to 28-year-old striker Joe Garner to the tune of "Glad All Over," has seen somewhat of a resurgence for the 1964 song by the Dave Clark Five, with Christmas fast approaching.
Glad All Over.