Web April Fools are very rarely funny, and now everyone does them. With all respect to those who worked on ours, I'm not sure it is either (it seems more like an "in joke" for us).
If we post a fake story, we'll be just the same as Slashdot and the rest. But we can do better. We have a limitless supply of *real crap* to draw upon. We can be lighthearted and play with the reader's credulity just as well by using stuff from [[Wikipedia:Unusual articles]]. I think all the featured articles in there have all been on the main page fairly recently, so instead I propose a special variant of Did You Know to take the place of the featured article on the main page. For example:
==Things you'll wish you never knew== ''From wikipedia's [[Wikipedia:Unusual articles|stupidest articles]]:''
* A 1919 '''[[Boston molasses disaster|molasses explosion]]''' killed 21 people. * [[Afrikaans language|Afrikaans]] pigs say '''''[[Oink|snork]]''''' and [[Korean language|Korean]] pigs say '''''[[Oink|kkool]]'''''. And we can prove it. * [[John F. Kennedy]] was almost certainly not a '''[[Ich bin ein Berliner|a jelly donut]]'''. * '''[[Belly button fluff]]''' is usually blue. Check yours. * '''[[History of perpetual motion machines|Perpetual motion]]''' is impossible. Probably. * [[El Salvador]] and [[Honduras]] fought a '''[[Football War|war]]''' over the result of a [[Football (soccer)|Football]] match. Don't ask who won the war. * The happy [[Ewok]]s won't be happy '''[[Endorian Holocaust|for long]]'''. Serves 'em right. * '''[[Le Pétomane|French culture]]''' blows the competition away.
And use [[Image:Shark big.jpg]] as the image.