Help getting revenge?

My mom has been a real b*tch to me lately. She's been blabbering about my school work when really it's not bad at all. I practice the piano a lot and she claims I don't at all which is extremely disrespectful to me and what i love doing. she sometimes claims that I set my books in a certain position to make it look like I was studying or playing the piano even though she was never actually there when I did those things. She's been doing this for months and its been ripping me up inside. She does this to me constantly and it tears me apart. She smiles at me and i can tell she knows i've been bottling these emotions and ive been shrouded in sadness and disappointment. Anyways what I'm trying to get at is I need a good solid way to get revenge. It has to be legal, of course, and it has to make her feel just as bad as she made me feel. It has to be something that will leave her with that thought in the back of her mind before she goes to sleep at night.