It wasn't smokey but here is a true story from about 1979 give or take. I took a truck to a big muffler shop in Dallas on I-30 for duel exhaust. That bunch and I kind of hit it off and something came up about -- what I forgot? However, one thing led to the next and they were telling me about their torch cannon.
They took a 20' piece of muffler stock, as they called it. They crimped one end. Then they put it into a vice pointed out of the building. Then they burned a hole near that crimped end. Then then they lit the acetylene / oxygen torch. Then they said that was the mixture they wanted. Then they snuffed it out on the concrete below, with the gasses still coming out. Then they put the tip into the hole near the crimp.
I'm going to guess that they only injected that mixture into the small hole for a few seconds. Then they said to hold our ears. Then they fired the torch up again and simply waved it over that hole.....Kaboom!!! It was only a gas noise bomb, but extremely loud.
They told me that they had taken some shop rags, wet them, and then tied them into a ball. They said that they fired this wet shop rag ball over I-30.
I didn't see it. However, I would be surprised if any of that bunch is still alive, with all limbs, eyesight, etc. etc.etc.
Something makes me think that with this bunch there will be a report "from the field."