(Kramer answers Jerry's phone and begins speaking Italian)
Jerry: What are you doing? What's wrong with you, what are you doing? Give me that phone. Go to your apartment and lie down, I'll make an appointment for a doctor today.
(Kramer mutters and leaves)
Jerry: Hello? Oh, hi, I'm sorry. No, that's my next door neighbor, he's not quite himself, he got kicked in the head.
Quote from S04E04 - The Ticket