I like it just for the amusement factor. But I think the fact that no message appears except when the system determines they've got untagged code, the warnings won't suffer from "always there" syndrome.

Sadly, even if we were to randomize the hint text, it would quickly take on a background noise quality. Because it's still always there in some form, whereas the warnings would only come up when there's a reason to grab the user's attention.