In paintball, Freight Training is an illegal move.  Freight Training is an attempt by a tagged player to affect the outcome of a game by lingering in the game.  After being hit, the player is supposed to put their barrel plug into the end of their paintball gun and immediately exit to the nearest dead box that will not cause any interference in the game.  If the player attempts to block a shot from an opposing player at one of their teammates, it would be considered freight training and can be penalized for it.  Another form of interference is deliberately getting yourself bonus balled.  Sometimes players will step out on the field with the intention of getting an enemy to shoot them in anger.  As soon as their enemy shoots them, the player yells out to the referee who will usually call a penalty on the opposing team.  All of these actions, if caught can get your team penalized.  Booooooo!