The 'Thursday the 20th' meme is a recurring internet phenomenon that traces its roots back to a scene from Disney’s The Lion King. In the original film, Pumbaa shouts 'Thursday the 12th!' while panicking, but a popular edit changed the date to the 20th. It gained significant traction on Tumblr and Twitter, where users wait for any month where the 20th falls on a Thursday to flood social media with the image. It has evolved into a meta-holiday for the internet, symbolizing a shared sense of niche community humor and the celebration of arbitrary dates that happen to align with the beloved warthog's frantic expression.