Florida Panthers fans have a unique tradition of throwing plastic rats onto the ice after home wins, which originated during the 1995-96 NHL season. Here's the backstory:
On October 8, 1995, a rat entered the Panthers' locker room before a game against the Calgary Flames. Team captain Scott Mellanby killed the rat by swatting it against the wall with his stick. Later that night, Mellanby scored two goals using the same stick, leading goalie John Vanbiesbrouck to quip that Mellanby had a "rat trick."
The next game, a fan threw a plastic rat onto the ice to commemorate the incident. Over the following games, more fans started throwing rats after Panthers goals, and it became an embraced tradition. By the time the Panthers made the Stanley Cup Finals that season, hundreds of rats rained down after each goal, requiring a partnership with pest control company Orkin to clear the ice.
While initially allowed after every goal, the NHL later restricted rat throwing to just after the final buzzer of a Panthers win to avoid delays. The "Year of the Rat" tradition became an iconic part of the Panthers' Cinderella run to the 1996 Stanley Cup Finals and a way for fans to show their raucous support.