Change "youtube.com" to "fullscreentube.com" on any video link.
Then you can link people to a full screen video, instead of some lame page that's covered with ads and comments.
Take your pick:
Changing the link is easy:
1 - Get a YouTube video like: http://www.youtube.com/watch?v=1GU-xCbTWvA
2 - Take out the "youtube" and put in "fullscreentube" to make the new link: http://www.fullscreentube.com/watch?v=1GU-xCbTWvA.