The rat trick is a celebration popularized by fans of the Florida Panthers of the National Hockey League (NHL) during their 1995–96 season and trip to the 1996 Stanley Cup Finals. The term, a play on hat trick, was coined by Panthers goaltender John Vanbiesbrouck after teammate Scott Mellanby killed a rat in the locker room prior to the team's home opener with his stick, then scored two goals with the same stick. Fans immediately picked up on the idea and began throwing plastic rats on the ice to celebrate goals. By the time the Panthers reached the 1996 playoffs, thousands of rats hit the ice after every Panthers goal, resulting in an off-season rule change by the NHL that allowed for referees to penalize the home team if fans disrupt the game by throwing objects onto the ice.
The 1995–96 season was the third in the NHL for the Panthers, who had been awarded as an expansion franchise in 1992. The team was composed of journeymen veterans and rookies and led by all-star goaltender John Vanbiesbrouck. As the team prepared for its home opener against the Calgary Flames on October 8, 1995, a rat entered the dressing room, startling several players. Scott Mellanby reacted by shooting the rat across the locker room with his stick, killing it. He then went out and scored two goals in a 4–3 victory over the Flames, leading the Panthers to their first win of the season. Vanbiesbrouck described the incident to reporters after the game, stating that while Mellanby failed to score a hat trick (three goals in one game), he did manage a "rat trick".
During the next game, a fan threw a plastic rat onto the ice following a Panthers goal. The following game, a few more rats hit the ice. Eventually, over 100 rats were tossed to the ice following Panthers goals, as the Panthers emerged as the top team in the league by mid-November. Eventually, Florida finished the regular season in third place in the Atlantic Division, and qualified for the playoffs for the first time.