A group called UDI (a bunch of guys from Siberia, by the way) was recently on Britain’s Got Talent. They do a gimmicky thing, and you can probably figure out how they do it. But the effects are wonderful and magical nevertheless.
Here’s one of their routines:
Here’s an article about them in the Siberian Times.
I do believe that’s the first time I’ve ever linked to the Siberian Times.