Mad Cow Disease
According to a short article I just read, this disease can incubate in a person's body, without symptoms, for fifty years.
Yes, FIFTY YEARS!
If I wasn't a worry wart before, I certainly am now.
For more scary facts about diseases: http://www.weather.com/health/deadly-salt-water-bacteria-20131016
For something much more entertaining, check out this slide show of people scared in a haunted house!
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