I like this song. It's about finding the true you and standing up for yourself, and knowing that no one can truly take that happy part of you. If you have seen the video, Katy gets mad at her ex, drives to a gas station, cuts her hair and changes, joins the marines, and becomes the better person. But, one bad scene is when she is in the bath tub (theirs bubble bath, don't worry), and her boyfriend, is there. Overal, it's a great, expressive song. I'm glad Katy turned over a new leaf.