When the Montreal Canadiens were eliminated by the New York Rangers, their mascot Youppi! lost a bet with Jimmy Fallon. So Sunday, Youppi! made good and wore a Rangers jersey around Montreal.
Other mascots are more obscure — take Gritty for the Flyers or Youppi for the Canadiens, both of whom are creatures of unclear origin. When it comes to the Oilers, they have Hunter the Lynx.