Agreed, that could make things very entertaining. And sure, I suppose something could be used as both a weight (like a tray of some sort with decent weight), as well as a method of holding the marbles...as long as it doesn't have edges to keep the marbles held in place. Or maybe a very short edge, to give him some hope of "assistance" in preventing the marbles from dropping. That could actually cause him to move a bit more, hearing the marbles start to roll, not wanting them to go over the edge...trying to compensate, but feeling the consequences of the electro shock in his ass every time he moves. ;-) Hmm, could maybe even somehow secure the tray to his chest so it doesn't fall off all together...maybe with some nipple clamps? He may actually want to lose some marbles to lessen some of the weight on his chest, but at the expense of feeling a shock to his dick and balls for every marble that drops. Decisions decisions! Now the only question is...how long to leave him like this? When all marbles fall, does he get released? Or would you pick them all up and put them back on the tray again, for a certain number of rounds of this? And if so, would you turn up the electro sound/movement sensitivity for each round?