How the Leif Erikson Day meme became a hinga dinga tradition

The Leif Erikson Day meme pops up annually on October 9, often referencing an episode of SpongeBob Squarepants. Popular awareness of the holiday skyrocketed after 2001, when SpongeBob woke up and declared it to be Leif Erikson Day while wearing a fake red beard and remarking "hinga dinga durgen."

https://twitter.com/okcmads_/status/1843876329789493522

Although the cartoon character claims to have made up the holiday in the show, it's a real observance in the U.S. and parts...