The final part of the Derren Brown Investigates trilogy is on tonight (Channel 4, 10pm). This time the focus is on a ghosthunter called Lou Gentile. My guess is that on this occasion our man will indeed be convinced that something paranormal is going on. Not.
There doesn't seem to be a trailer as such available for tonight's show, but there is some 'exclusive footage' from the show on our old friend YouTube:
It's a toss up between whether we watch DBI or the final episode of Flashforward, which is on Five at the same time. Luckily I imagine both will be available to watch on the web (or on Channel 4+1 for DBI) so we won't miss out either way!