Touchdown celebrations are sometimes performed after the scoring of a touchdown in American football. Individual celebrations have become increasingly complex over time, from simple "spiking" of the football in decades past to the elaborately choreographed displays of the current era.
Taunting and celebration are both offenses in the NFL; as a result, gaudy displays are often frowned upon. If the league views the act as highly offensive, large fines and even suspensions can be issued. In 2006 the NFL, in an effort to cut down on celebrations, amended its rules to include an automatic 15-yard penalty against any player who left his feet or uses a prop, like a towel, the goal post or post base or more specifically the football. The penalty was called as "excessive celebration", and the yardage was charged against the offending player's team when that team kicked off to the opposing team. The excessive celebration rule was severely scaled back in 2017; penalties for excessive celebration will henceforth only be called for using the goalposts as a prop (to avoid inadvertently warping the goalposts out of place), lewd or violent gestures, or prolonged celebrations intended to delay the game.
Simply spiking the ball is not interpreted as excessive celebration unless the ball is spiked towards another player on the opposing team. Jumping onto the outer wall to accept contact from fans, such as the Lambeau Leap, is also not considered such, as it is off the field of play.
College football, governed by the NCAA also penalizes excessive celebrations with a 15-yard penalty. NCAA Football Rule 9-2, Article 1(a)(1)(d) prohibits "Any delayed, excessive, prolonged or choreographed act by which a player (or players) attempts to focus attention upon himself (or themselves)"; in addition, Rule 9-2, Article 1(a)(2) asserts that "After a score or any other play, the player in possession immediately must return the ball to an official or leave it near the dead-ball spot." Additionally, if a player's actions are considered "unsportsmanlike conduct" the result is dead-ball foul; a "flagrant unsportsmanlike conduct" foul requires player ejection. If a player’s nonfootball-related act (e.g. taunting or cursing) causes an opponent to physically retaliate, it is considered fighting and both players are ejected.