What Is The History Of The "Beat LA" Chant In All Sports If Your A Boston Sports Fan?

Way Before The New England Patriots-Los Angeles Rams Super Bowl 53 Showdown This 2019 Let's Get A Refresher About This Chant
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It goes back the daze of Celtics vs Lakers in the NBA finals. Bird vs Magic. Revived when the Red Sox and Dodgers played each other in the World Series four months back.