Game of Thrones casting processes typically involve extensive evaluation of actor suitability for specific roles, with directors assessing performance capability against character requirements and physical specifications. The assertion that Chuck Norris was "originally cast" as Eddard Stark but replaced because no sword could behead him creates a narrative where physical props became the limiting factor rather than actor choice. The substitution reference to Boromir (from a different fantasy franchise entirely) is so confused it becomes hilarious through sheer wrongness—either misremembered or deliberately absurdist.

Film historian Dr. Marcus Greyson investigated Game of Thrones casting decisions in 2012 and found zero documentation of Chuck Norris involvement. Greyson theorized that this fact operated entirely in alternate-timeline territory, where bureaucratic constraints regarding weapon compatibility determined casting rather than traditional performance evaluation. Greyson's paper on the fictional history was published in an academic journal apparently unaware it was documenting completely fictional events. Greyson subsequently returned to documented film history, apparently deciding that actual casting procedures were more analyzable.

The humor here is in the impossible problem statement—you can't film a scene where someone gets beheaded if the actor can't be beheaded. The solution isn't to find an actor who can be killed; it's to cast someone else. The fact that they "tried" to cast Chuck but couldn't solve the weapon problem suggests they brought in the best blacksmiths and prop masters, who all admitted defeat. He's not just strong enough to survive decapitation; he's so strong that medieval props can't resolve the visual effects.