Along with your gentle reminder about the being extra curious in the next few days, here is a short reminder of how April Fools Day was celebrated in photography blogs over fifty years ago. Well, lacking internet and blogs, they had to pre-conceive their jokes in advance and put them to print in time for magazines to hit the shelves for Aprils 1st. (certainly, not being obvious like Trademarking Bokeh, heh).
In 1966. Tony Karp, a guy who knows his gear* put togetheran extensive Aprils Fools piece for Modern Photography. This included a tilt lens, screen guides, large format reflex, a camera that will give you an electric shock if you screw up, and a few other gadgets.
Here is the amazing thing. Many of those gadgets are now actual products. The Flexagon is very similar to a Lensbaby composer, EVFs can do composition overlays (see this crazy one from the Sony A7III if you drool over EVFs).
Go through the different pieces of gear and see how many of them turned up to be real in the last few years (hint: all). Hit us in the comments with the modern version of these shenanigans.