The sound comes from Strange Wilderness, the 2008 comedy film about a struggling wildlife television host and his crew searching for Bigfoot. During their misadventures at sea, a shark appears and, unexpectedly, laughs in a distinctly human way, a gag that turns the animal into an unlikely comic character. The moment was clipped and shared on soundboards and short-form video, where its odd, memorable laugh made it an easy shorthand for mocking or undercutting a scene. It endures because the joke needs no context to land.