The "white rabbit" was an item in the movie The Matrix. Part of the plot. On the disc they added a feature called the "white rabbit" that would take you to certain "how they did it" films at the proper point during the movie. Basically, when there was something to look at a little icon would appear on screen as you were watching the movie. If you pressed ENTER it would take you to a short clip, then when that was finished back to the movie. The problem is it caused a lot of trouble on older players.