The whole episode online here:
http://roblaughter.com/seance.php
You may notice many more parallels to Derren Brown's work in this bit that in the others, but I tried to really add my own twist to the idea.
I started thinking about what to do for my Halloween episode last month. First I was just going to freighten some students in some way... Then I settled on the seance.
My discussion of the tarot is deplorable; I was just making stuff up. Go easy, Craig et al.
Other than that... Comments? Advice? Glaring errors?