The 25th anniversary of Deep Blue Sea is generally not seen as a significant cultural event. In the grand context of a world spinning wildly off its axis, finding time to remember that movie where scientists use shark brains to cure Alzheimer’s can be difficult.

Yet Deep Blue Sea deserves to be remembered. Not for the events of the film itself—though it is, remarkably, still one of the best shark movies ever made—but rather for the incredible original rap song that plays over its end credits, “Deepest Bluest (Shark’s Fin).” In that rousing ballad, rapper and Deep Blue Sea co-star LL Cool J delivers what could best be described as a shark’s diss track to the rest of the world sung from the shark’s perspective. Best remembered for the lyric, “Deepest, bluest, my hat is like a shark’s fin,” it occasionally makes the...