If you're someone like me (one who feels incomplete without having every album/EP/song from a band) these can get EXTREMELY annoying. For some reason which I don't know (I was told by a friend that it was some sort of agreement Japan had with the music industry) they always get them.
Person A: YES!! I finally have every song by DragonForce!
Person B: I think you forgot about those Japanese bonus tracks that appear on all their albums.
Person A: What?
Person B: You don't have 'Where Dragons Rule', 'Cry of the Brave' and 'E.P.M.'.
*Person B walks away*
Person A: My life is over *sniff*
*Person A pulls out a gun*