I filled up a big balloon with hydrogen, tied it off, put a fuse on, lit and let it go. Do not do that inside an industrial building, dust was falling from the ceiling supports for a good ten minutes. I also couldn't hear for a couple of minutes.
<<<Didn't learn the lesson the first time, and repeated it to show someone else.
50 years ago, I was working in a truck shop. A driver was hanging around the shop. He got bored, so he was lighting the cutting torch, snuffing out the flame and filling condoms with the oxy/acy mixture, taking them out back, using a sheet of newspaper for a fuse, and setting them off....they sounded like dynamite blasts. They would be about 18" in diameter and 4 feet long.
The old mechanic told him several times not to do that again because we heated the shop with an old smudge pot heater. Well, he fills another one, wraps it in newspaper, puts both arms around it to protect it and starts toward the back door. As he was passing the truck we were working on, it went off in his arms. We were up in the cab of an F-model MACK, and like you, we couldn't hear and the dust was terrible. After a few seconds, we could him scuffling around on the floor....thought he was going to die, we did. When we got to him, he couldn't see or hear anything. His face and eyeballs was tattooed with the ink from the days paper.... and it was backwards. Took a couple of hours in ER before his hearing and eyesight began to come back ....and couple of weeks for the ink to wear off his face.
