The St. Louis Blues rode Laura Branigan’s ‘80s hit “Gloria” to a Stanley Cup championship, but the World Series-bound Washington Nationals’ adopted theme song has even more bite.

The popular children’s song “Baby Shark” has become a rallying cry for the Nationals since outfielder Gerardo Parra started using the tune as his walkup music in June because of his 2-year-old daughter’s affinity for it, according to NBC Sports Washington.

As has become customary at Nationals Park this season, much of the crowd made the shark-chomping motion with their arms when Parra came up as a pinch-hitter during the series-sweeping NLCS victory over St. Louis on Tuesday night.

Several fans were shown dressed in shark costumes during the game and players have adopted the shark-chomping gesture when reaching base. “Baby Shark” peaked at No. 32 on the Billboard Hot 100 chart earlier this year.

“We’re not here solving the world’s problems,” Nationals manager Dave Martinez said. “We’re here playing a baseball game. I want (the players) to have fun. I want them to be loose.”