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Hours earlier, Krasinski pulled out an unexpected move when he shared a video from the game, which was in Boston, featuring a special guest star -- none other than David Denman, aka Roy from \"The Office.\"

Roy was Fischer's on-screen ex on the hit show, and fans couldn't get enough of the prank.

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Game 7! Let's do this!#Stanleycup @nhl @msjennafischer

A post shared by John Krasinski (@johnkrasinski) on Jun 12, 2019 at 5:08pm PDT

Fischer played into the joke as well, commenting \"Ha. Ha. Ha. Be careful he doesn't leave you at the game.\"

Real fans remember Pam and Roy's first date was to a minor league hockey game -- where Roy brought his brother and left without Pam when the game ended while she was in the bathroom.

Angela Kinsey, another member of \"The Office\" family, added, \"Whaaaaaat the effing whaaaat?!!!\"

Denman also shared a video with his pal at the game, in which Krasinski said he was bummed Fischer couldn't make it to the game.

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If only you'd have called @msjennafischer Sorry. May the best team win! @nhl

A post shared by David Denman (@david_denman) on Jun 12, 2019 at 6:05pm PDT

Along with Fisher, another Dunder Mifflin employee celebrated the Blues win -- Ellie Kemper, who played receptionist Erin Hannon on the hit show.

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GLORIA! GLORIA! GLORIA! Let's Go Blues YOU DID GO BLUES CONGRATS @stlouisblues on WINNING THE #stanleycup!!!!!!!! 💙🎶💙🎶💙🎶💙 (and congrats @msjennafischer on that amazing VICTORY CAKE) #proudstlouisan

A post shared by Ellie Kemper (@elliekemper) on Jun 13, 2019 at 5:42am PDT

\"GLORIA! GLORIA! GLORIA! Let's Go Blues YOU DID GO BLUES CONGRATS @stlouisblues on WINNING THE #stanleycup!!!!!!!!\" she captioned her post.

\"(and congrats @msjennafischer on that amazing VICTORY CAKE) #proudstlouisan,\" she added.

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