Rubber balloons or paper bags should be the least risky way to go.
lol, if, and thats a big IF, I try this I will be wearing my dads welding helmet, leather apron thingamajig, gloves and any other safety equipment he has lol.
man I'm a totall pyro but I'm a rational pyro.
What I think would be cool would be too fill a tire with acetalyne and light it. hehehe. What luck, my mimi owns a tire store and has thousands of junk tires laying around.