The old days stuff was... Bottle rockets Sparklers Firecrackers Cherry Bombs Ash Cans M-80s Roman Candles
All of which were and still are 'illegal' in NJ
We get everything here that is ATF defined consumer grade but the cherry bomb/ash can/M-80 stuff (federal law after some politically connected girl got killed near DC. That limit is 50mg of explosive material. (a regular firecracker) OTOH you can have 130mg in a aerial shell.
If you have an acetylene rig and some balloons you can rock the neighborhood. Get that cutting torch set up for a good burn and use it to fill the balloons. You can use pretty small ones (cantaloup sized). The trick is lighting them.
The sound is deafening.
If you get up in the large beach ball range, you can break windows.