The NFL was lauded for its plan to put the fun back into touchdown celebrations but the new rules could have an unintended consequence: grounding the Lambeau Leap.

According to the rules announced Tuesday, group celebrations will now be allowed, including previously verboten acts like rolling around on the ground and using the football as a prop. Among the actions that remain banned are those depicting a weapon or aimed at embarrassing opponents like Randy Moss pretending to moon the fans at Lambeau Field or Terrell Owens...