Psychics are, generally speaking, charlatans who use word games and common sense to prey upon the gullible and uneducated. Good work if you can get it, but let's not pretend that it should ever be taken seriously.
Good videos:
By Richard Dawkins:
https://www.youtube.com/watch?v=d1ejmKC_DiM
Derren Brown - longer interview - part 1 of 6:
https://www.youtube.com/watch?v=idVxRE8uM-A
Derren Brown on faith healers - similar charlatans to psychics:
https://www.youtube.com/watch?v=jYjgeayfYPI
"...where hope is peddled at the price."
James Randi exposes James Hydrick:
https://www.youtube.com/watch?v=QlfMsZwr8rc
BBC on the issue - exposes three mediums:
https://www.youtube.com/watch?v=u4qGfNViVN8
Penn & Teller:
https://www.youtube.com/watch?v=MQnqRaVT9tY
Psychics are leeches, sometimes self-deceived, often damaging, and always either wrong or right by fucking happenstance.
Similarly, we can easily replace the title "psychic" with "cultish religious founder." Same people. Same difference. Same result.