11-18-2017, 10:19 AM
If he's a welder (or has access to welding gas) it could be he's putting acetylene and oxygen into a trash bag and igniting it. It sounds like a bomb going off and the shockwave is strong enough to rattle windows etc, but it generally has no shrapnel.
https://www.youtube.com/watch?v=DU4-S1ViZeA&t=0m18s
The FBI accepts anonymous tips.
ETA: "When I was in Samoa years ago, one of the popular pastimes by teenage boys was to take a long tube, bamboo or metal pipe with one end sealed, then pour some kind of flammable liquid into it."
It's called a "Polish Cannon". They can be used launch tennis balls etc if one is interested in more than just the sound. It was later refined with ABS tubing to create "The Potato Cannon".
https://www.youtube.com/watch?v=DU4-S1ViZeA&t=0m18s
The FBI accepts anonymous tips.
ETA: "When I was in Samoa years ago, one of the popular pastimes by teenage boys was to take a long tube, bamboo or metal pipe with one end sealed, then pour some kind of flammable liquid into it."
It's called a "Polish Cannon". They can be used launch tennis balls etc if one is interested in more than just the sound. It was later refined with ABS tubing to create "The Potato Cannon".