The bet was if the Canadiens lost the Eastern Conference finals to Fallon's New York Rangers, Youppi! had to pose for pics of shame - in a Rangers jersey!
Here are photos of the long-faced mascot taken around the city Montreal.
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'Star Wars': 15 biggest celebrity fans
From Stephen Colbert to Tina Fey to Megan Fox, some of the biggest names in Hollywood were inspired by the George Lucas movies of their youth.
(Photo by Colin E. Braley/Invision/AP)
Chris Brown owns 14 Burger Kings
Peyton Manning, Kanye West, Magic Johnson, Rick Ross, Jimmy Buffett, and Hank Aaron also own fast food joints.