[maybecorrect]

I thought the trick was you spin the egg, then stop it - a raw egg will continue to rotate because the fluid inside is moving, but a cooked egg won't restart because nothing inside it is moving.

This link shows a hardboiled egg spinning on its end, but otherwise seems to agree with me, though it doesn't quite contradict you: http://www.planet-science.com/categories/experiments/magic-t...