Via Esha Neogy on the Our Bastard Language Facebook group, this Andertoon:
Sentence 1 asserts that some text is grammatically active, but sentence 1 itself is a grammatically passive. Vice versa for sentence 2. Each sentence shows a discordance between a grammatical voice as the topic of a text and the grammatical voice of the sentence about that text. Not actually a contradiction, much less a paradoxical self-contradiction, but a language prank that flirts edgily with these possibilities.
What it is like is the discordance of the Stroop effect, where a color name and the color the name is presented in are at odds, as in this New Yorker cover by the artist Saul Steinberg:
(#2) In my 6/15/17 posting “For Saul Steinberg”, a discussion of the effect