It seems a strange coincidence that the first summer Brody serves as chief of police in Amity would see a rogue shark just happen to wander into Amity's waters. And when Brody's being pressured to report Chrissie's death as a boating accident, the phrase "It's happened before" seems ominous. Also, that tiger shark they catch is a man eater and "extremely rare for these waters"; another coincidence that there were two rare maneating rogues in those waters and they caught the wrong one. Or was the tiger shark planted to get caught and calm people back down?