From the Lord of the Rings Trilogy character, Grima Wormtounge, who wormtounges Theoden to sign papers and unable to lead. Wormtounging is professionally done by Grima, but can also be effective with almost anyone. It is the process to persuade someone to do something that will cause harm, mostly to another. The wormtounge, often repeating the same words to the person and encouraging them to do it.
"Kill him... break his bones"
"Are you going to take that?"
"Are you going to let him do that?"
"He made you look like a fool"
"Look how he treats you"
"If I were you, i'd kill him, you know you want to"