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The 12 Most Intense Rivalries

Since there are more than 7 billion people on this planet, it's pretty obvious we're not all going to like the same things. Usually, we try and accept that we're going to disagree about what is "the best," but there are a few occasions when we are allowed to get aggressive with someone because they're just flat out wrong. Check out some of the fiercest rivalries in the world, and don't forget that the Hatfields and McCoys feud begins on Memorial Day, at 9/8c on HISTORY.

1. Dogs vs Cats

2. Pepsi vs Coca Cola

3. First Class vs Coach

4. Blackberry vs iPhone

5. Republicans vs Democrats

6. McDonald's vs Burger King

7. Good vs Evil

8. Chocolate vs Vanilla

9. The Boston Red Sox vs The New York Yankees

10. Regular Pencils vs Mechanical Pencils

11. Sega vs Nintendo

12. Chunky vs Creamy

Inspired By History's "Hatfields & McCoys"

View this video on YouTube