Originally posted by: DrPizza
small bonfire, surrounded by a fire ring... when it's just hot coals, carefully and quickly place the propane cylinder upright on the coals.
Runnnnnnn....
Actually, I'd love to see that. We put an empty spray can into a small fire once, with the end against a cinder block. That thing shot across the river (about 50 yards) plugging into the soft mud on the other side, and resulting in a boom that echoed up and down the river valley.