I never looked at Family Guy because it was a clever show. Not even remotely. I looked at it because it was dumb. Dumb humor and dumb subjects. I couldn’t say that I enjoyed it as much as other TV shows I watched, but I guess it was okay. It was okay until they completely copied the subject of one of the South Park episodes. And in the show’s characteristic manner they did it poorly. Copy something and do it poorly…
Anyway, for reference the South Park Episode is Cartman’s Incredible Gift, first aired on Dec 8, 2004. You can see it on southparkstudios.com: http://www.southparkstudios.com/episodes/103851
The lame episode from Family Guy is called Extra-Large Medium and was aired on Feb 14, 2010.Lame.
Later Edit: I’ve been informed that there is another South Park episode, different from one above, called The Biggest Douche in the Universe (aired on Nov 27, 2002 !!) that also mocks psychics. You can watch it here: http://www.southparkstudios.com/episodes/103625 Copying one episode: Lame. Doing something that another show already did twice: Totally Lame.