On two of my recent album purchases, there is a section that appears at the end of a track that is musically unrelated to what came before and what comes after it. So much so I've come to assume that they are 'hidden' interludes, untitled and unlisted on the album. One appears on Southern Empire's self-titled debut (between Hold and How Long), and the other comes after #Addicted from Riverside's Love, Fear and the Time Machine.
Do you have other examples of this?