From Wikipedia: The phrase "perfect storm" refers to the simultaneous occurrence of events which, taken individually, would be far less powerful than the result of their chance combination. Such occurrences are rare by their very nature, so that even a slight change in any one event contributing to the perfect storm would lessen the its overall impact. The term is also used to describe a hypothetical hurricane that happens to hit at a region's most vulnerable area, resulting in the worst possible damage by a hurricane of its magnitude. But in our context, an event needs to be funny as well as shocking and mind-blowing. Hurricane Katrina, an actual giant storm, doesn't qualify because of its tragic nature. Likewise, if the Dick Cheney shooting incident had resulted in the victim's death, it would have inspired Amiright songs that were sad or angry, rather than silly and mocking. So there are boundaries of taste. The Mark Foley/Congressional page scandal really, uh, skirts the issue, since there is almost certainly some sort of crime that is, because of the age of the victims, quite disgusting.

Note that "twenty parodies" is not a requirement for a topic to be considered a "perfect storm," although sometimes it works out that way. The words just fit the rhythm of the song. Rhythm of the song. Into that verse it's placed. The origin I've traced... Sorry, still stuck in parody mode. ROTS (just realized that unfortunate acronym) is one of those songs that gets in your head, and leaves your brain squirming like a toad. (Best line Jim Morrison ever wrote.)