> Can take up to 30 seconds to blow, even on a hot fire, plenty of time to
> retreat.

The worst is when after 2 or 3 minutes it still hasn't blown, what to do?

Another interesting one is to put baking soda and vinegar into a bottle and 
put the lid on quick (or use some cunning method to delay the mixing of 
vinegar/soda).  500 ml soft drink bottles can take a huge pressure before 
exploding!

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