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Empty soda or beer cans full of oxygen and acetylene, yee haw. It sends the can tens of feet into the air, makes a loud bang like a gunshot, and makes grown men giggle like little girls.

My uncle did this with trash bags. Big boom.

I did as well (50:50 with oxygen), ignited with a shot from a roman candle. Close enough to knock me over when I was 14. Realized how fucking stupid it was when I thought about static electricity and trash bags....

> static electricity

My dad did bag bombs in his twenties. He was worried about them exploding while he handeled them, so he put on wool mittens to protect the hands...

My chemistry teacher did this with hydrogen and oxygen inside of the classroom. It was one of those "desk waste basket" trash bags rather than a proper 50-galloner but even so it was so loud I was surprised the windows didn't blow out. I think she stuck with party balloons for that demonstration from then on.

It works even better with punching bag balloons.