Acetylene balloons, oh what fun, thought we youngsters. Never had the remotest thought of the danger.
In the 1950's we kids probably exploded thousands of them. Even filled inner-tubes on special occasions.
We graduated to acetylene and oxygen looking for a bigger bang than
carbide in a milk can bombs.
The first time we learned the awesome power of a simple acetylene balloon was when we fitted 6 elongated balloons in the top of a 16 gallon grease barrel. Laid a piece of newspaper for a fuse on top, lit it and run.
Even though the top was open, the upper two thirds of the grease barrel tore into about 8 inch somewhat roughly round pieces of shrapnel.
The bottom one third section remained on the ground intact, looked like it had been cut off at the rolling ring with a saw.
Fortunately no one got sliced by the shrapnel, myself not liking the shock wave pounding my ear drums, hid behind a bulldozer. Here's
a video of a mild explosion of this type.
Still set off a few balloons on the fourth of July for the grandchildren. Wrap them is a piece of newspaper and light it with a long stick.
The balloons look so innocuous that the first time the kids don't expect the bang to come. You'll hear a couple of "HOLY FAQ's" from the boys, the girls normally just run.
Often think of repeating that barrel explosion on a YouTube video to demonstrate the destructive power that these balloons actually possess.