Have you watched the show "Scare Tactics" on Scifi?
Many of the gags they pull have unbelievable premises: Area 51 scenarios, MIBs, monsters, the dead coming to life, reenactments of urban legends, etc. It is amazing what people are willing to believe. I keep wondering (hoping) if they have a lot of footage of gags where the mark wouldn't go along -- wouldn't believe. I hope that I would fall in the latter category.