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Lampshaded: "Did that idiot just broke my plan by accident!? NOOOOOOOOOOOO!"
Exploited: John, a Guile Hero, notes that Bob is an idiot, and, with a few supervisors for the latter, use Bob as an Unwitting Pawn against Emperor Evulz. Bob, being the idiot he is, is unaware of this.
Defied: Emperor Evulz have his guards set fences, strictly enforce the "No Commoners Allowed" rule, and place his animal in case they do.
Discussed: "Hmm... This guy can definitely destroy Emperor Evulz's plans. The Emperor can't predict him."
Conversed: "The idiot always ruin the mastermind's plan if not monitored."