Remember that old Saturday Night Live skit where Dan Akroyd plays a sleazy toy manufacturer? He sold products like Johnny Switchblade, Bag O' Glass, and Halloween costumes like The Human Torch and The Invisible Pedestrian to unsuspecting children. Well, this is kind of like that.
The Flaming Footbag is pretty self-explanatory. It's a hacky sack made of Kevlar armor which you then soak in kerosene, light on fire, and kick around with your pals. Freedom Footbags has them for $24.99 each (shipping adds $4 more). Be sure to check out the demonstration here. Oh, and be careful, too.