Even Mr. Met is frustrated with the team's disappointing start.
New York's funny-looking mascot flashed his "middle" finger at a fan during Wednesday night's 7-1 loss to the Milwaukee Brewers, and the team says the employee who did it won't work in the costume again.
A person tweeted video of the incident, which soon went viral online, and the club quickly issued a statement.
"We apologize for the inappropriate action of this employee," the Mets said in an email attributed to the organization. "We do not condone this type of behavior. We are dealing with this matter internally."
A Mets official told The Associated Press more than one person wears the Mr. Met costume during each season, and the person who wore it Wednesday night will not work in the costume again.
Mr. Met, known for an oversized head with baseball seams, is among the sport's most recognized mascots. Technically, he has only four digits on his hand - three fingers and a thumb.
Expected to contend for a playoff spot, the Mets are 23-28, hurt by injuries to ace starter Noah Syndergaard, closer Jeurys Familia and slugger Yoenis Cespedes.
Earlier in the season, Mets pitcher Matt Harvey didn't show up for the next day's game after a late night on the town, causing the team to suspend him for three days.