Derren Brown?
Every time I watch this show I can't help wondering how well 'Master Bullsh*tter' Derren Brown would do on this show. I mean, the guy has pretty much made a whole career out of spotting the liars and being an alround master bullsh*tter himself. So it would be quite interesting to see just how well he'd do against these 'amateurs', eh?
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"Never finish what you can't start!" ;)