Heath Ledger’s Oscar-winning portrayal of The Joker in the 2008 Batman film The Dark Knight gives the public the wrong impression of people with mental health problems, according to one European charity.

Dr. Peter Byrne, a film expert and consultant psychiatrist at Newham University Hospital in London, who wrote the report for the Time to Change Campaign, claims the humor and violence of the hit film was based almost entirely on the stereotypical potrayal of the mentally disturbed.

“Batman describes the Joker as a schizophrenic clown, and when the film’s second hero Harvey Dent becomes ‘Two-Face’ and embraces evil, the familiar stereotype of schizophrenia is activated…The incorrect stereotype in both cases, to a lesser and greater extent, is that schizophrenics have multiple personality disorder, and that that second personality is always evil.”