Humans are rational creatures… for the most part. There have been plenty of times when common sense went out the window and large groups of people fell prey to panic, paranoia, and mass delusion.
A famous example is the Salem witch trials when an entire town became convinced that witches had infiltrated their community. Consequently, they killed over 20 people to put an end to the nefarious coven which, by the way, never existed. Of course, they are hardly the only ones who gave into their hysteria.
This is an encore of one of our previous lists, as presented by our YouTube host Simon Whistler. Read the full list!