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Some people have no problems making different parts of their body do different things at the same time, some can do it when they concentrate (me), and some can`t do it no matter what they do.
It isn`t a sign of intelligence or anything, more so a sign of how your brain is wired up.
Pretty cool though, must say it got me the first couple times.
I`ll fully admit that immediately my foot did start going in the opposite direction.