A small bit of diesel in a dish ...
Powdered chlorine pool shock in an inverted dish above the diesel.
Brake fluid drizzled onto the chlorine.
You now have 30 seconds to two minutes to GTFO.
https://youtu.be/c-vUeAXjQTw?t=595
This method can be easily set up with a timer to dump the fluid onto the powder.
Now ... another fun trick is to use the old cigarette in a matchbook method. I recommend using a home-roll for it though, since modern commercial smokes have a plastic in the paper to put out the cancerstick after a short while. Alternatively, use a rubber band and wooden matches around a home-roll.
Fun for everyone involved!
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