That's as obnoxious as texting unsolicited CAT FACTS to Ken Thompson!

Hi Ken Thompson! You are now subscribed to CAT FACTS! Did you know your cat does not concatenate cats, files, or time — it merely reveals them, like a Zen koan with STDOUT?

You replied STOP. cat interpreted this as input and echoed it back.

You replied ^D. cat received EOF, nodded politely, exited cleanly, and freed the terminal.

You replied ^C, which sent SIGINT, but cat has already finished printing the fact and is emotionally unaffected.

You replied ^Z. cat is now stopped, but not gone. It is waiting.

You tried kill -9 cat. The signal was delivered. Another cat appeared.

After receiving the "stop" message, the AI did send another email to apologize instead of immediately stopping, so you're not too far off.