I'm not an expert on musical theory, but I do find key changes to be fascinating. Playing the same piece in a different key gives it a completely different feeling—and especially if you play a song in a minor key that wasn't originally written that way.
PkTaco shared with us a minorized version of Making Cupcakes, and it sounds like an entirely new (and kind of creepy) song. Give it a listen!
Thanks for sharing, PkTaco!