Matt Damon and Jimmy Kimmel Rivalry Continues at World Series Game 5

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The Oscar winner wore a red shirt, while the 'Kimmel Live!' host wore a blue one — both had "I'M WITH STUPID" written with an arrow pointing at each other.

There was another feud happening at the World Series.

On Sunday night, Oscar winner Matt Damon and talk show host Jimmy Kimmel attended the World Series Game 5, between the Boston Red Sox and Los Angeles Dodgers, and appeared to be sitting next to each other.

Both stars were wearing the same T-shirt — Damon a red one and Kimmel a blue one, which read “I’M WITH STUPID,” with an arrow pointing at each other.

The color of the shirts represented the team that the men were rooting for: Damon for the Red Sox and Kimmel for the Dodgers.

The Bourne Identity actor and the comedian were also accompanied by another famous pal and die-hard Sox fan, Ben Affleck, who appeared to remain neutral.

The famous rivalry dates back 12 years, when the comedian began jokingly apologizing on Jimmy Kimmel Live! for not allowing Damon on his show due to time constraints.

The Red Sox won Sunday night's game, giving them the championship for the fourth time in 15 years.