add to the list
1) I will not bring a magic 8 ball to divination
2) Prof. Flitwicks name is not Yoda
3) I will not draw a dark mark an a clasmate when they fall asleep
4) I will not call Prof. Umbridge Dumbridge
5) if a few death eaters drop out of the sky do not say "even nevile has more friends than that"
6) I will not go up and yell "bother" to anyone
7) Snape is the exception
8) First years are not to be fed to Fluffy
9) there will be no underground dog fighting involving fluffy and fang
10) or the basilisk
11) or the giant squid
12)when atacked by u no who don't say "i have 8 horcruxis, beat that"
13) do not call dumbledor santa
14) do not call him voldysnort
15) never send harry a toilet seat when he is in the hospital wing
thats 15 for you to work with