Nothing in the glorious world of sport sets the pulses racing quite like a good-old fashioned rivalry.
Regardless of the event in question, nothing typifies the sort of admirable passion and commitment that is wrapped up in sport quite like an occasion on which two rivals go head-to-head.
It is also often somewhat disturbing and even a touch frightening to witness just how seemingly ordinary and rational people can take relief of their senses and mutate into bile-spewing hatemongers when their rivals are in town.
Here, following on from our look at individual sporting rivalry, GMS looks at 10 of the most intense and fascinating team rivalries in the history of sport.
The scope for such an investigation is huge, of course, and with so many rivalries meaning different things to different people, many will obviously not make the list. We have also tried to include a range of separate sports.
So, click through the list to get started and view our selections.
Do you agree with our choices? Which of these rivalries do you believe is the greatest or the most intense?
Are there any particular rivalries that you think we have missed?
Be sure to let us know below...