smoke from anything trick –
Here is a video of tiny fog machine. Magicians have been using similar rigs to make smoke come from nearly anything. Several years back a guy marketed them to produce smoke from empty hands. After watching this video, you could rig a small black box with wrist strap (via spiderman) and give it to an outside actor to entertain with. Making smoke appear in people's hands, in their shirts, and even while doing magic tricks.