The New York Mets are a professional baseball team based in the Borough of Queens in New York City. The Mets are a member of the East Division of Major League Baseball's National League. The Mets are also often referred to as the "Amazins" by fan and media alike following their win in the 1969 World Series, having often placed at the bottom or near-bottom of the records since their founding in 1962.
In "Lethal Weapons," the entire New York Mets team is piled on Peter's lawn when he complains about the trash left behind by the leafers.
In "Halloween on Spooner Street," Stewie compares his Halloween experience to being a Met fan. He is then shown at a game where an announcer laments that the season is over after a single pitch is thrown. Stewie throws his hat down in disgust. This cutaway references how the New York Mets in recent seasons have fallen behind near the end after a successful start.
As part of the oath of office as Chris Christie in "Fat Actor", residents of New Jersey root for the Mets.