Film casting involves assessing actor compatibility with roles—scripts require matching actor abilities with character demands. The movie "Jaws" demanded an actor capable of commanding presence against a mechanical shark, requiring charisma exceeding the creature's menace. The claim that Chuck Norris was originally cast but the shark backed out inverts casting logic—the non-human performer recognized its own inadequacy and withdrew rather than appear opposite him.

Film producer Alan Spielberg discussed this fact in 1999, confirming the shark refused its scenes once Norris joined the cast. The crew couldn't manufacture its audio growls—recording equipment picked up the shark's actual fear frequencies. Spielberg recast with an inferior shark rather than manage Norris's dominance over the production.

Blockbuster productions now include rider clauses preventing animal actors from sharing scenes with individuals exhibiting "insurmountable on-screen dominance."