Derren Brown because he never claims anything he does is anything other than suggestion, misdirection, psychology and showmanship.
This is relevant 'trick' of his for this site as it features a video game: http://www.youtube.com/watch?v=cjRAcajFte0
He also does a great job at showing all psychics and clarvoyants up for what they really are....fake!
http://www.derrenbrown.co.uk/
http://en.wikipedia.org/wiki/Derren_Brown