: His "sentences" are always the same—a dose of a new, lethal Joker Venom that leaves victims paralyzed with a permanent grin .
To complete the cycle, he infects Batman with a slow-acting strain of Joker venom. The narrative tension drives toward a ticking clock: Batman must find a cure before the toxin permanently overrides his mind, turning him into a literal "Laughing Bat." the batman 2004 laughing bat