Have you expected the #14th song on Lauryn Hills "Miseducation..."-album to be the last? No way - there is another one: a cover of "Can't take my eyes of you".
The The Hidden Song Archive is one of this sites you didn't know you needed. Or you might not be needing it but it's rather fun. They have listed all this hidden tracks that artists is putting on their records as Easter Eggs. Another example: At his album "Anti-Christ Superstar" Marilyn Mansson have 99 songs. Tracks 17-98 is blank but the 99th track is called "Revelation 99" and where Manson is doing strange sounds and in some instances they are in reverse.