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(discuss.tchncs.de)
Post funny things about programming here! (Or just rant about your favourite programming language.)
Maybe a play on "This page intentionally left blank" from the IBM manuals
This is in no way unique to IBM manuals.
The phrase is present in loads of books and in some cases has been for quite a few years.
https://meh.com/forum/topics/nothing-is-lacking-the-long-history-of-intentionally-blank-pages
https://www.google.com/search?q=%22this+page+intentionally+left+blank&udm=36
That would make sense. It's a playful book with many jokes in it