http://www.dvdeastereggs.com/
Lots of 'em... but doublecheck tat you have the correct version - when a movie is re-released, the easter egg sometimes disappears.
Original DVD release (not the 10-year anniversary special edition) of
Apollo 13. Leave it at the menu screen and you will hear the complete James Horner score to the film. (The official soundtrack release doesn't contain much of the score except dialogue and popular songs of the era, and a promotional release which has more score is extremely difficlt to find.)