I have so many, but there was one time that literally even my mom got mad.
In sixth grade art class (where all the fun happens) we had made Japanese tea cups, and when they we all done we had a class tea party. My teacher (we'll call her Ms Paine) told us that we could bring our own tea and cookies of we had liked. So, my friend (we'll call her Becky) who I sat next to in the class brought us some tea and I brought us an extra box of girl scout cookies I got. When it was time for class, a few kids had brought things like sugar cubes and those little spoons and stuff like that. I put the box of cookies at my desk and Becky put her tea down on her desk. No joke- Ms Paine quieted down the class, and told everyone to look at me, and said "Rory, did you bring enough cookies for the WHOLE class?" And I said "No... They are just for me and Becky" and Ms Paine proceeded to tell me "You know, it's VERY VERY rude to bring something and not bring them for EVERYONE." Keep in mind, Becky is sitting right next to me with four packs of her own tea. Apparently I was the only one who brought cookies when literally three other kids said that they'd bring some. Also, this conversation is happening with everyone staring at me. Ms Paine said "We're mad, but we don't hate you, Rory" and some kid in the front row screamed "I DO!" and a couple of his friends nodded their heads. I just said "... sorry..." And then Ms Paine said "Notice how *name* brought enough sugar for EVERYONE, how *name* brought enough spoons for EVERYONE, how *name* brought enough lemon for EVERYONE!! NEXT TIME you HAVE to bring enough for EVERYONE because you ARE VERY VERY VERY RUDE." Becky then made the mistake of counting my cookies and said that there is enough for about 2/3 of the class, so then people were coming up to me like GIVE ME A COOKIE and having to say "it's just for me and Becky" so many times with Ms Paine staring at me was painful. This whole time Becky is just making the tea that she brought like wtf. I told my mom about it because yeah I'm that kind of person that actually talks to her parents, and she was no joke mad at my teacher.
tl;dr bitchy art teacher is mad at me for doing nothing she said anything against
Moral of the story- don't take bring cookies to class because the teacher might just get jealous