Following Jeffrey Dahmer's imprisonment, his parents, Lionel Dahmer and Joyce Flint, questioned if they could've prevented the murders of 17 men and boys.
For years, parents have worried their trick or treaters might be poisoned by an unsuspecting neighbor on Halloween, but is there any validity to the myth?
Learn about the Fox sisters, spirit photographer William H. Mumler, and more infamous scammers who duped people into believing they had special powers.