I've been using ExtractNow for awhile now to unzip my SG downloads. If you haven't tried it, you should! It's this free utility that unzips more than one at a time.
So this morning, I'm unzipping lots of goodies and this alarm goes off!

It sounded a lot like a fire alarm from a school or something. I had no clue what happened, but it made me jump. (It was a little after 6am, mind you!) My kids thought my laptop was about to explode. It was kinda funny!
Know what it was? LOL... apparently when ExtractNow runs into a file it has a problem with it sets off this alarm.
So just in case you're a ExtractNow user and you've never come across this nifty little feature (in over a year, it's never happened to me), you've been warned.