Loud (I mean LOUD) Beep

My MBP has done some strange things from time to time with the speakers... The odd loud pop... some crackling... I just chalked it up to persnickity Mac... However, I was just playing a little CIV IV, when I got the scare of my life.
A LOUD (and I can not emphasize the LOUD part enough) beep (sounded like system beep) ERUPTED from my speakers, in fact it was so lound I have a little ringing in my ears.
The beep was only a second... Then there was the aformetnioned pop crackle, then everthing was back to normal.
What was that?
Is it a heating issue? (I asked this based on the fact these werid things only seem to happen when Im running somthing that makes the system 'cook')
Seriouly... Im worried that somthing is messed up with my MBP...
My current up time is about 2 days... CPU temp currently (a minute after this happend is 64) CPU is 74% idle RAM 15mb free, HD 10 gig free currently on a wired network - 2.16 GHz Intel Core Duo w/ 1GB 667 MHz DDR@ SDRAM.
Help.
Thanks

I have had something similar although I wouldn't call it a beep. Probably about three times in the past many months a loud crackling, buzzing, and cranking sound has been emitted from my laptop's loudspeakers. It's probably equal to or less than one second in duration. Very quick and extremely loud. I was not doing anything in particular to evoke this. And, there seem to be no pattern to what I do that would cause this. This has happened only about three times.

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