Futulitycloset.com warns inventors with this story:

A man about 43 years of age giving the name Joshua Coppersmith has been arrested for attempting to extort funds from ignorant and superstitious people by exhibiting a device which he says will convey the human voice any distance over metallic wires. He calls the instrument a 'telephone,' which is obviously intended to imitate the word 'telegraph' and win the confidence of those who know the success of the latter instrument. Well informed people know that it is impossible to transmit the human voice over wires, as may be done by dots and dashes and signals of the Morse Code. The authorities who apprehended this criminal are to be congratulated and it is hoped that punishment will be prompt and fitting, and that it may serve as an example to other conscienceless schemers who enrich themselves at the expense of their fellow creatures.

– Boston newspaper, 1865, quoted by Edison's assistant Francis Jehl in Menlo Park Reminiscences, 1937