On Twitter - New York's Metropolitan Transit Authority challenged the CTA to one slice of hometown pizza for every home run.
The CTA told the MTA to be prepared to deliver a lot of slices - and then showed a video of Kyle Schwarber's monster homerun against St. Louis.
Not to be outdone - Mayor Rahm Emanuel's office tweeted out a friendly wager to New York Mayor Bill de Blasio. Mayor Emanuel says he will would send de Blasio a few Chicago-made products - and make a charitable donation if the Cubs lose.
Mayor de Blasio has yet to respond.