Edited sentence: During the 1989 World Series, baseball caps with both teams' logos and colors, split down the middle,  were a popular novelty item.Giants fans seem to save their enmity for the Los Angeles Dodgers, with whom their rivalry is anything but friendly.Unlike other regional interleague rivalries, such as those between the New York Yankees and the New York Mets and the Chicago Cubs and Chicago White Sox, the Bay Bridge rivalry is generally good-natured.While fans are happy to have local bragging rights for their team, any teasing or mocking is largely done in fun