tombi123 on 21 August 2007
legend11 explanation seems to be the best so far on here. It is certainly nothing mystical or to do with the devil or any crap like that. The human senses and mind can be easily tricked by something that has a logical answer. Quite obviously it is that you try harder second time without noticing because first time you failed to lift the person. And that the person in the middle feels more nervous (therefore his body is more tense/rigid) second time because they have been told that this amazing "trick" works, therefore is expecting to be lifted of the chair.
I am willing to bet if person E was knocked out, therefore body remains relaxed throughout the "trick" it would not work.
