Lyric discussion by aemitt 

Cover art for Madness lyrics by Alanis Morissette

I always saw the chorus as a sarcastic "fuck you" to the boyfriend that makes her act this way. I never thought she was actually saying thank you.

Not sarcastic at all. It's all about calling herself on her shit instead of pointing the finger and getting to the root of her suffering in relationships. I think it has a lot to do with some sort of emotional manipulation that she does that she hadn't even noticed until that man rubbed it on her face and made her see how she fools herself and tricks herself and tries to trick her partner too.

@aemitt her thanks are quite honest, actually. She is truly saying how grateful she is for being able to see where this madness comes from, thanks to them, who she used to blame for her own problems.