Yes, Equus, a great film/play with Richard Burton if I remember correctly
Based on a true case, from Wiki
"Shaffer was inspired to write Equus when he heard of a crime involving a 17-year-old who blinded six horses in a small town near Suffolk.[2] He set out to construct a fictional account of what might have caused the incident, without knowing any of the details of the crime. The play's action is something of a detective story, involving the attempts of the child psychiatrist, Dr. Martin Dysart, to understand the cause of the boy's actions while wrestling with his own sense of purpose."