You send me an email or text reply with nothing more than, "K!"
That right there is a conversation ender. No further interaction with YOU today.
Furthermore, 9/10ths of the time that "K!" isn't even necessary.
Thanks to you, you SINGLE-HANDEDLY have destroyed my enjoyment of texting or emails with this obnoxious little idiosyncrasy. Not only do I hate talking on the phone with you, I hate non-verbal communication, too! SCORE!