We are all familiar with user manuals or documents with pages printed with "intentionally blank" ... but with those words on them, they are no longer blank!
I'm pretty sure I saw a user manual once with pages like this:
We were going to say this page is intentionally blank, but once we did, we realized it isn't blank any more.
Would there be a better way of expressing this concept? Such as "intentionally conveys no useful information"? (Except, now it does - it conveys that it has no useful information)