Damn, I saw David Blaine ask someone this on TV. I realize it's reading body language and I'm no master magician, but 37 was the number I thought of, and that's the number David Blaine said.
Those tricks do rely on body language quite a bit....but it is strange that some picked that same number.
well there isn't that much combinations you can think of, unless you are an idiot like me and pick 24 because you get lost in that odd even thing