A clueless MacOS Rumors reader (Eric Christensen in case you're curious) wrote this little gem and sent it in...
Take a look at the default button you have to click to close the warning. Damn, that's funny. Someone at Apple messed up I guess.
As a side note, I only pulled this into Photoshop to save it as a JPG from a TIFF. I did not change the word on the button. That's how it displayed."
Ryan Meader replied:
Of course, what Eric and Ryan weren't clueful enough to figure out was that this dialog actually comes from the MacReporter dockling, not Mac OS X's Software Update system.
Anyway, definitely worth a laugh.
Damnit what is it with people playing ABBA's Dancing Queen? ARGH! First at work, now here.