Did you know that if all the people in China jumped at the same time, the whole planet would steer off its orbit. This has been proven by mathematical calculus by mass and weight bla bla, If you believe in that anyway... China has more than 1 billion people so...
...so 1 billion people on the opposite side of the earth would then have to jump just to get the planet back on track....
No, it would'nt work. They all have different sized chairs, which would effect timing. They are on different distances from sea level. Cecil from The Straight Dope answered a question on it. The man is a genius btw, like the EllisDTrip of the internet, so he's probably right.