Ventriliquist
A Ventriliquist can't get any bookings so his friend suggests that he starts up as a clairvoyant so he sets up his own business. One day an old woman comes to him and asks if he can contact her late husband and he tells her that he can and says that he offers three services costing �25, �50 and �75.
She asks what she will get for each and he explains that for �25 he goes into a deep trance, crosses to the spirit world and seeks out her husband and then comes back and gives the message in his own voice,
�50 - same trance - same spirit world but this time she'll hear the message in her husbands voice and for �75 he does it drinking a glass of water.