This is very cute: A short history of Thomas Edison‘s public relations campaign to scare the public into believing that George Westinghouse‘s rival power distribution system, alternating current, was more dangerous than Edison’s own, direct current.
Edison tried to demonstrate the "danger" of Westinghouse’s AC system by executing animals though electrocution. His employees publicly executed dogs and cats. Edison’s company even executed an elephant and filmed the electrocution. Edison’s company developed the electric chair and Edison promoted it to demonstrate the danger of alternating current.
This short animated history lesson is delivered to you by a cat: