That's what I don't understand....
If I had filled the tumbler to the brim with cold water and
microwaved it, I can understand.... steam would be expanding into a
limited space, causing a major pressure buildup....
But in this case, I poured water that was already hot to begin
with..... and only 3/4 of the way, at that. There shouldn't be
enough of a pressure buildup to cause the cap to blow.
Tat calls for an experiment~~!!! 
After 1 day of unproductive day at work ytd, today I finally
devised a solution to do the job more effectively and faster...
yay~
Hmmm, I mentioned this here b4... Anyway director asked me to
wait till march to get a new phone becoz of some
new regulation thingy with the 3 service provider... Supposely
he's quite sure that the price of all phones will drop... However I
dun see the reason why the price will drop...