All I can say is if you are in your garage, in town and that happens police will be paying you a visit even in the 1970's.
Sounded like a bomb went off, it was way louder then the acetylene balloon we made.
I think part of the problem today is too many stupid and unlucky kids survive childhood. You need to be one of two things to be an adult, lucky or smart, and you become smart by playing with trashbags full of acetylene gas and making them go boom. You don't do that again. Smart and lucky, I only blew out a few windows in the shop. That is another thing I still feel to this day. You learn not to do that again. Everything you did stupid had a price that had to be paid.
But man it was so cool.