“After WW-2 we used to buy weather baloons at the Surplus store, fill them with oxygen/acetylene, put a long fuse on them and release them at dusk at evening rush hour and blow out a lot of windows when it went off at about 10,000’.”
Basically, that’s a fuel-air bomb.
The following contains a possible ethnic slur, but consider where I’m from and the times described: in the 1960’s, my neighbor made a “Polish cannon” - which was 3 or 4 beer cans (how to make one is described on the ‘Net). Very loud, and cheap!