once upon a time, swimmy had some not quite right powder, which he dissolved in near boiling water, drop-wize, adding onl one extra drop; followed by several drops of acetone.
looking real close at this little puddle, swim could see all this wiggly motion...it reminded him of brownian motion on a larger scale...and the motion was carrying tiny particles of crud to the outside perimeter of the puddle. this was mere seconds beefore the liquid beecame not liquid.
may have been strictly a gravity related phenomenae, except for the wigglyness.