An older kid up the street was into home made rockets and went to Auburn University and became an aerospace engineer later. He was taking CO2 pellet gun cylinders and packing them with zinc oxide and powdered aluminum same as is used on the space shuttle boosters.One he tied to an 8"x8"x16" cinder block thinking it would hold it down for the test fire. It didn't. It towed the block about 100' up into the air. As exciting as that sounds it was the trip back down that was really exciting trying to figure out where it was going to land.
Someone I consider a master woodworker once told me that a master woodworker is not someone who never makes mistakes. He is someone who is able to cover them up so that no one can tell.