Pass-tray

I've always seemed to notice, that in a room filled with smokers, theres often only one ashtray. The phrase "pass the ashtray" is undoubtebly a common one. However the process is always such a bane. If is has to travel accross the room, everyone in its path have to participate...no one likes a black thumb! If, however, there were an ashtray, shaped like whatever, with slidable door on the side...it really wouldn't be such a problem would it? Throw it around the room to whoever needs it....ash in it, and extinguish by cuting off the air supply. Rubber coated and lightweight ofcourse, and capable of being unscrewed for cleaning ofcourse, and a great idea ofcourse.