Hitchhiker's Guide To The Galaxy, The Easter Egg - Infinite Improbability Drive

There is a random feature on Disc One of this set. If you allow the menu screen to play through the theme tune without moving the cursor, then Episode One will normally start playing. However, sometimes a slightly 'warped' version of the opening sequence of Episode One will play, which will then be replaced by a message telling you that your DVD player has been taken over by the Infinite Improbability Drive!