A psychiatrist was testing the mentality of a patient.

A psychiatrist was testing the mentality of a patient.
"Do you ever hear voices without being able to tell who is speaking or where the voices are coming from?
" asked the psychiatrist.
"As a matter of fact, I do," said the patient.
"And when does this happen?
" asked the psychiatrist.
"Oh," said the patient, "when I answer the telephone."