First I thought of filling it up and listing it as a BIN on the bay. Or maybe start at .99 cents and see where it goes?
Second was to fill it up and offer it as the next contest for the members here. Of course I'm certain everyone here will go for this one.
I'll have to come up with on heck of a difficult question. maybe something like "on what date will the earth come to an end"?. Now you only win if the world does actually end on the date you pick and you have to past the case to the guy to the right of you who has a halo over his head!
Third is to just fill it up and keep it and taunt you all with it!