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[On the subject of Heath Ledger's Joker] This character who attracts psychotic henchmen may have lingering symptoms from his own past psychosis. He keeps making involuntary, repetitive movements—flicking his tongue, smacking his mouth—which suggest tardive dyskinesia, a condition that arises as a consequence of long-term or high-dosage use of antipsychotic (neuroleptic) medication.
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