skeptiCat said:

From Zak's twitter (don't mock me for following him, its purely for laughs)

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"skeptiCat follows Zak!  skeptiCat follows Zak!" said Revenant in a mocking tone.  Oh, wait…

The "experiment" is more of a survey:

1) Do you want to be on an episode of Ghost Adventures?  If yes, continue.

2) Are you currently an exotic dancer?  If yes, continue.

3) Are you willing to stand half-naked in a towel in a completely dark "haunted" house while we film you with our hand-held night-vision cameras?  If yes, congratulations!  You are going to be on Ghost Adventures!  Your code-name with be "bait."