...that Java is used on many different devices? Well, yeah, you probably did know that part (around 2.5 billion actually)... But you probably didn't know that all Blu-Ray players include Java?

In a normal DVD, the menu system is a number of MPEGs with links between them. This approach is also used in HD-DVD (although probably improved in some way). This approach is not very elegant, so Blu-Ray has taken a different approach: The menu system is made with Java!
This means that you can do basically anything you want in the menu system. And furthermore: Combine this with an internet connection and you have dynamic content! You know how annoying it is to watch an old movie which contains trailers from movies that came out many years ago. Well, utilizing this feature, trailers are always up to date. It could also be used e.g. by movie studios, who could just release the movie and then later add the subtitles. Or you could put in a little game perhaps?

To me, that's pretty cool... And if you want to know more, have a look here.