The 'Fish Jenga' meme is derived from a 2017 YouTube video by Sam O'Nella Academy titled 'Surreal Laws From Around the World.' The joke centers on the United Kingdom's Salmon Act 1986, which contains a section regarding the handling of salmon in 'suspicious circumstances.' In the video, an officer discovers a man literally playing Jenga with stacks of fish, leading to the panicked shout, 'IS THAT FISH JENGA?!' The meme gained massive popularity for its surreal humor and is frequently used to describe situations where someone is caught doing something bizarrely specific, yet technically illegal or frowned upon.