1. Person suffers a loss or misfortune.
2. Person makes widely inaccurate extrapolations on the actual danger, without seeing the broad implications or consequences by scaring people into woefully uninformed behavior, under the guise of 'but look! it happened to me! It'll happen to you!'.
Case in point from the media last week: ticks and Lyme disease. Some woman on the news on a personal crusade against Lyme because she contracted it when she was 13 and it caused major issues in her 20's. Sucks for her, of course, and some sort of public awareness about checking for ticks when you've been out in nature is good; but her message was hysterical. Our local equivalent of the CDC basically says 'we have basic awareness campaigns, but we don't want to scare people from going outside, because the benefits outweigh the risks'. And then you have one person who has her 15 minutes of fame, spreading massive misinformation about risks to a general population that isn't capable of understanding the concept a normal distribution curve, let alone make an assessment on an epidemiological risk.