Over at ThinkGeek I stumbled on the smoke ring gun. I was "I gotta have" at first sight. I mean is shoots cool, floating smoke rings!!!
Well, it arrived in the mail yesterday and the kids and I have almost gone through a whole bottle of smoke fluid (which is A LOT of smoke rings). So standing over the stairs (where there are overhead lights that make the rings stand out) you can find us shooting smoke rings.
There is a "speed" setting on the gun which sets the speed that the smoke rings speed away from the gun. The current game is to shoot a slow ring then switch to fast rings and try and shoot through the slow moving ring.