Re: DANCING COALS!
Make sure your hookah is standing on a sturdy surface, not some kind of shaky table or anything like that. I've put my hookah on a chess board with legs before and it was just so unstable that every time I took a hit, the whole hookah started rocking back and forth.
Oh and how much water do you have in your bowl? If it's too much in there, that could be the problem.