As kids we have irrational fears, like monsters under the bed. As adults, most of those fears are replaced with new ones, some legitimate and others just as irrational. One irrational fear that has been passed down by most of our parents is the danger that lurks in Halloween candy, and we are not referring to the high sugar content. We are referring to the threat of razor blades and poison-laced goods that are almost assuredly in any slightly unsealed treat.
The five psychological factors that lead us to worry about low-probability events are explained in the following article.