Musk's social media antics were part of an April Fool's prank, but investors weren't laughing. Tesla shares dropped another 5 percent, according to The Washington Post, with business experts openly questioning Musk's ability to lead the multi-billion dollar company.

At The Washington Post, we like to get into the spirit of the holiday by rounding up every corporate April Fools’ joke we can find and debunking them all in a humorless list. Let’s get started.

Every year, journalist Ben Black publishes a playful fake story on his community news site Cwmbran Life for April Fools' Day. Since 2018 the 48-year-old has created a number tales, from a Hollywood-style sign on a mountain to a nudist cold-water swimming club at a local lake.