How exciting! I've found my very own easter egg in a piece of software!
Librarian that I am, I'm busy cataloguing my library by scanning the barcodes in Delicious Library. Hey, don't knock it, it's fun.
I got to the more obscure end of my bookcases - in this case, Star Wars X-Wing for the IBM PC, an old Lucas Arts Game. The barcode refused to scan, so I entered the barcode number manually - 0 23272 20512 6 - and the computerised voice read out the title.
After a longish pause, a breathy male voice cut in with 'I am your father!'.
My god, what an obscure joke to embed deep in the code... but I now love the software even more.