I'm not a Katy Perry fan, but I've got to admit, this song is pretty much an anthem. I blame my obsession with this song on three things. 1) celenipimping it before; 2) Anna singing to it in her car during a rare break from thesis work; 3) the applicable themes of the song to the relationship I imagine that Rob/Kris have. I'm not even going through this kind of drama and I feel the pain of the song! I hope I'll never have to relate to it.