We do this experiment in honors chem at Princeton HS when we study intermolecular forces.
The general response that I get from most students the first time they do the experiment successfully is general grossness and stunned. The peeling of the 'skin' of the cocoa is just so gross.
We, admittedly, don't do the demo with the lycopodium powder, but we might be doing that in the future. We do something similar to that with Magic Sand, though.
And we certainly don't do the demo with the vacuum pump. I have a vacuum pump, though. Interesting. Might be worth trying in the future.
And the flammable water at the end...hmmm...
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