LOL.
I used to make mini-sized pyro stuff for toys as a little'un, that was fun.
Such as drilling a hole in the backside of a troll-doll, and supergluing a shotgun shell up there, after first pouring in some black powder, flash, NC or just plain old lighter fuel.
Used to find it hilarious to watch, especially the flash powder ones, there is significant confinement from the fairly thick rubberized plastic, and flash powder needs very, very little of that to go off with an earsplitting bang, with the bigger size of troll, thats quite a hefty charge where flashpowder is used as the filling.
And flash...its sensitive enough to be set off easily but safe to handle carefully (I.e away from sparks, flame, static discharge, friction or mechanical shock).
White spirit/petrol/ etc make good troll doll fillings too, and produce a nice satisfying fireball.
Oh boy...and the day I found out (while too young to have a bank card to set up an account with a chemical company, and had to make almost every single reagent used from scratch) that instant icepacks of the single-use kind are often full of ammonium nitrate (very insesnsitive yet powerful and dirt cheap base for quite a few HEs, but more useful still for making my HNO3 from. Toluene, sulfuric, 3-step nitration with mixed nitration acid.