My idea which tracks is that since in the world of Jaws we don't know how long sharks live or if they even die, that the great white attacking Amity Island could have been AT the Indianapolis, and because we didn't know radiation shielding the same back then, maybe it even got some glowing green atomic rays in it, making it big AND smart. Even smart enough to cross over half the world and come to get revenge on a sailor soldier who escaped its teeth in 1945, but is now spreading word of sharks’ lifeless doll eyes, making everybody just shoot sharks on sight, when really they just want to swim
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