A *very* long time ago when I didn't know about the effects of fire + hair spray, I had a cool thought of litting up paper in the toilet and then extinguish it with the hair spray....
Well.. instead of the fire going away, the hair spray turned out ot be a flamethrower
It was pretty cool... but I decided to never do that one again..
(I was too young to be educated of it by the movies of hair spray flamethrowers :>)
Then cousin had some of these plastic soldier figures and some of those vehicles, tanks and planes which comes with them in same packs.
We used to shoot those with a gun and burn

The melting plastic dropping down was pretty cool looking and sounding.
What was cooler, was burning other friends toy cars.
Metal frame and plastic tires/inside.
Of course we burned bit bigger toy car, which was a spring powered.. you know.. roll it backwards on the floor and then it'll goes forward.
At first it didn't lit up at all.. but then it lit up with nice big flames all the sudden and lit up nice and bright :>
The metal must been dealt with some kind of oil... or the paint.
During burning the spring gave up and made some sudden bang from inside the car when it gave up.. we scared that one :>
Those cars looked quite neat.. little bit of hammering and they would have looked very much like been in an accident ;P
Otherwise.. nothing bigger.... always safe player
