Well, there WAS Krakatoa...even thought it was
closer to Java...perhaps the whole archipelago
got all of its cracks out in one big bang?
Seriously, I've never come across a bean that
goes through a roast properly and doesn't crack
twice.  My current Sumatran does.  But some beans
are louder than others---which I have a (totally
irrational) gut feeling has to do with bean
hardness.  I roasted some Guatemalan yesterday
from last year's crop and almost hit the deck
when first crack started.  BANG! BANG! it went. 
Perhaps the Sumatran is just a bit quieter...
Cheers,
Paul
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