It sounds like the start of a great joke: "So, Bill Murray walks into a press briefing at the White House wearing a Cubs hat and Cubs jacket." Except that it really happened Friday.

Murray, a well-known Cubs supporter who is in D.C. to receive the Mark Twain Prize for American Humor on Sunday, made a stop to say hello to President Barack Obama -- a staunch White Sox fan. And he decided to hold an impromptu news conference to explain why the Cubs will beat the Dodgers in Game 6 of the NLCS on Saturday (8 p.m. ET on FS1):

Bill Murray crashed the White House press briefing to talk up the Chicago cubs https://t.co/QXzSJ8JS01 pic.twitter.com/aWGu9JEE5W

— NBC News (@NBCNews) October 21, 2016

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"I feel very confident. Clayton Kershaw is a great, great pitcher, but we've got too many sticks. … And at home, our crowd, the weather."

Not bad for a former golf club groundskeeper, huh?

A few photos from the leader of the comedic world's visit to the White House: