>> 500 ml soft drink bottles can take a huge pressure before exploding!
>
> I've seen that done with dry ice and water.

What surprised me was that the ridges, the inverted base and all the other 
features in the plastic got pushed outwards, the outside of the bottle 
became really smooth, and *rock* solid to touch (it felt like it was full of 
concrete).  We chucked it about a bit but it still didn't pop, so we put it 
on the fire!

Yes I know this was ridiculously dangerous looking back!

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