P. T. Barnum,
The Humbugs of the World — Chapter XII
(1866)
“ When thus placed, skeptic is directly between the medium and her husband, and with his back to the latter. The husband plays spirit, and with his right hand—which is free, the other only being held by the accommodating spiritualist—pats the investigator on the head, thumps him with a guitar and other instruments, and maybe pulls his hair. ”
