"A squeeze-back is the practice of literally squeezing the end credits of a program to one side of the screen in order to use the other side to promote an upcoming show. Squeeze-backs were invented by NBC in the early nineties as a way to keep people from channel hopping. By squeezing the credits over and using the remaining space to tease viewers with what was coming up next, they found they could retain them and prevent the habitual end-of-show channel hopping."--from The Age of Persuasion: How Marketing Ate Our Culture by Terry O'Reilly and Mike Tennant (Counterpoint, 2009).
I love to watch the end credits of a TV show or movie. Whenever the credits get squeezed, I get annoyed. The same people who do these squeeze-backs are probably the same ones who immediately stand up in a movie theatre and block my view of the end credits.
Shame on you, NBC, for inventing this practice. Thankfully I don't have to put up with those squeeze-backs on DVD, yet.