My rule is a little out of the box, but I think that it would make for some entertaining hockey and bring a ton of excitement to the fans. It would be a two part rule. Firstly, any player who scores a goal must sit in the penalty box for one minute following their goal being scored, unless said goal is scored within one minute and thirty seconds of the end of any period. This will up the scoring while also giving goalies more chances to make great saves, and will boost numbers across the league as a whole. Secondly, if a player at any time scores their third goal in a game, they immediately must participate in a fight with any of the opposing team, decided by that team's head coach. If the player wins the fight, defined as either knocking off the opponent's helmet, knocking the opponent to the ice, or causing the opponent to surrender, then the player continues with no repercussions and foregoes the one minute penalty. However, if the player loses, they are given a 5-minute penalty. However, once two minutes have passed, the player will be released from the penalty box upon an opponent scoring a goal.