A shark (probably a tiger shark, I guess) gets caught by shark fin soup mercenaries, and they cut off its dorsal fin and throw the shark back (or else the shark escapes by writhing back into the water before they can do anything else to it). So after this, the shark has no self-esteem left, as it finds no-one in the ocean is afraid of it anymore without that scary dorsal fin (a shark's trademark intimidating feature). All the other sharks tease and bully this poor shark for not having a dorsal fin, which is a real source of pride for sharks (like a Klingon's forehead). So the shark decides life isn't worth living if nobody is scared of it, so it decides to go get itself killed by people to end it all. So the shark swims over to where there are people, but nobody even notices the shark without its dorsal fin sticking up out of the water. That's when the shark has a "eureka" moment: without the dorsal fin, it can now sneak up on people and they wouldn't know what hit them! (And the shark can get revenge and overcome adversity at the same time! A heartwarming story of redemption!) So the shark embarks on seek-and-destroy missions against people on beaches, eating them all, and gets away clean each time. Then the shark becomes a hero to all the other sharks and sea creatures, and is given the nom de guerre of "The Shark Fin Soup Avenger" (while humans refer to it as "The Ninja Shark" due to its ability to strike stealthily and without warning)! And everyone under the sea lives happily ever after, with all the oceangoing people eaten by the shark, and the rest of humanity forbidden to do anything about it due to the new shark fin soup ban. And conservationists the world over cheer! (The End.)
See? Now isn't that an inspirational story? It will be like A Dolphin Tale, only without dolphins or their tails (because the shark has eaten them all too). And it will be extremely popular with environmentalists, I'll bet! (Plus, there will be enough gore to please any hardcore horror fan or misanthrope!) I hope Disney will make it tomorrow!