In one of the Terry Pratchett Discworld novels, there is a troll who goes by the name of Zorgo the Retro-Phrenologist.

The logic being, of course, that if the bumps on your head define your personality, then altering those bumps will naturally alter the personality, too.

People seeking treatment sit in his chair, and Zorgo, with a carefully tuned set of hammers, sets about making subtle alterations to the topography of his patient's skull.

He was a bit character, but it was an amusing concept.