A man called a psychiatrist in desperation.
“You gotta help me, Doc,” he said. “My neighbor thinks he’s in an opera. He sings all day and night at the top of his lungs, and it’s driving me insane!”
“Have him come see me,” said the psychiatrist.
A few days later, the man called the psychiatrist again.
“I don’t know how you did it, Doc, but he’s not singing any more,” said the man. “Did you cure him of his delusion?”
“Not really,” said the psychiatrist. “I just gave him a much smaller part.”