April 1st, 1835
a New York newspaper published an article claiming that a scientist had discovered life on the moon, including bat-like creatures and unicorns 

it fooled people into believing the moon was a wild, mystical place 🦄


https://blogs.loc.gov/teachers/2015/03/primary-sources-and-april-fools-day-the-great-moon-hoax-of-1825/