We used to play with 'stones bombs' at bike rallies which was any glass screw top bottles filled about a third full of petrol, placed upright in a camp fire.
The petrol eventually boils, pressure increases , forces the cap to unscrew, petrol turns to gas and forms a mini mushroom fireball, loads of fun and generally harmless
Unless someone gets bored waiting for the climax and runs over to the fire and kicks the bottle, then it will fall over, the lid comes off one shoots a fireball straight at them as they run like fcuk in the other direction, great entertainment
By the way, never use a bottle more than 3 times, the glass gets heat affected and will likely crack letting half a litre of petrol flow happily into a fire and straight out across the surrounding are
.ask me how I know this
And the reason they are called stones bombs is stones green ginger wine was the drink of choice for hard core rally goers back in the 80s