Anything the media/government uses to blow out of proportion and strike fear into people.
Swine Flu, Anthrax, Mad Cow, Cuba, Marijuana, Sars, Terrorism, Global Warming, Fuel crisis, etc. etc.
Hey James, did you hear about the swine flu epidemic that's going around? I feel pretty sick I think I might have it.
Dude, that's a typical effect of problem saturation. You're fine.