On April 1, 1974, in Sitka, Alaska, locals woke to what seemed like a volcanic eruption at Mount Edgecumbe. A Coast Guard pilot investigating the smoke found a pile of burning tires with "APRIL FOOL" written in the snow, a prank by local Oliver “Porky” Bickar. He had informed the FAA and police, but not the Coast Guard, leading to the prank's early discovery yet widespread coverage and acclaim.
duckyoumate on April 1st, 2024 at 07:55 UTC »
source
Edit: More pranks(as shared by a user below)
nydboy92 on April 1st, 2024 at 08:41 UTC »
The boy who cried natural disaster
Frost_St on April 1st, 2024 at 10:03 UTC »
How does one haul a bunch of tires all the way up a mountain