I will not try to set my homework on fire with merely the power of my mind, nor will I cheer loudly and take a bow when I finally succeed in the middle of class.

I will not use my modified version of the measuring spell to write down the number of words I used rather than the inches.

I will not teach the students how to play Rock, Paper, Scissors with real rocks, papers, and scissors.

I will not transfigure all of the snow on the grounds into a million snowglobes.

I will not use my memory of my aunt's voice to send screeching Howlers to people who send threatening letters.

I will not use my wand to scratch my shoulder while practicing conjuration.

I will not convince the house elves to serve me butterbeer rather than pumpkin juice.

I will not make smores during Potions class, even if I have already finished my potion.

I will not wear Weasley's Wizarding Wheezes shirts unless I am certain they will remain on me without somehow floating away and introducing the student body to my own body.

I will not sell temporary tattoos that look like the Dark Mark, even if they are colourful and glittery.