@ClaraListensprechen@universeodon.com @smellsofbikes @NilaJones Humor circulars, yes, I wish I had saved some from back in the 70s and 80s. Nat. Semi did some good ones on op amps. There was a good one that came out of IBM in the 1990s on changing mouse balls.
A good source would be the April editions of ED (Electronic Design) an ordinarily serious magazine, but for April Fools, you had to watch out. There would be fake articles and fake ads, some of which were so good it would suck you in and you wouldn't realize until the end that you'd been had. Bahahaha.