I love to analyze Jump-The-Shark moments as it applies to people, nations, and political moments. For example, the Jump-The-Shark moment for the Soviet Union was the moment when Ronald Reagan, with twinkling eyes, bobbed his head slightly in his 1980 debate with Jimmy Carter and said, "There you go again!" It was that moment marked the collapse of Carter's campaign, brought about the election of Reagan, AND leading ultimately to the fall of the Soviet Union.
The Jump-The-Shark moment for the Roman Empire was when Marcus Aurelius died in 180 A.D. and was succeeded by his degenerate son, Commodus.
Jump-The-Shark moment for J-Lo came when she fired her original manager.
Jump-The-Shark moment for Kevin Costner was when he drank recycled urine in "Water World."
Finding such Jump-The-Shark moments are FUN!