Talking to himself

Lawyer: "Was the deceased in the habit of talking to himself when he was alone?"
Witness: "I don't know."
Lawyer: "Come now, you don't know and yet you pretend you were intimately acquainted with the deceased?"
Witness:
Witness: "I don't know."
Lawyer: "Come now, you don't know and yet you pretend you were intimately acquainted with the deceased?"
Witness:
Spoiler: