I usually go with "Test. Mentioning the existence of this message can make you the target of all sorts of unpleasant things. Ignore this message or else.
You don’t get it. You’re still acknowledging the existence of the message since you’re reading it. You still don’t get it. Either this message exists, or you do. It’s a zero-sum game. Do you enjoy existing?
Always make your test messages something like, “Test message, please ignore”.
That way if it all goes wrong at least it looks like it was somewhat intentional.
I usually go with "Test. Mentioning the existence of this message can make you the target of all sorts of unpleasant things. Ignore this message or else.
You don’t get it. You’re still acknowledging the existence of the message since you’re reading it. You still don’t get it. Either this message exists, or you do. It’s a zero-sum game. Do you enjoy existing?
Are you thinking about it? Wrong.
Test."
I bet he learned more today than he did all of last year. One of us!