Mean teacher probs? 10 POINTS PLZZ HELP?

So our teacher (Mrs.Kelley a.k.a. Mr.Belley-Kelley-Fattey) is so mean to us. Today we were annoying her and we were sneezing and coughing on cue and dropping our books at the same time and then she yelled at us. But we only did this because she is always yelling, screaming and being rude. She yells at kids. She talks about bad parenting skills, for kids who misbehave. She only has one favorite and that is Carrie (a.k.a. Karrie, Queen of Dorks, Nerddy Black) and she is a kiss-up. Everyone hates her. The whole grade hates her except for Karrie. And she said if we ever try to "terrorize" her again by dropping books she is going to tell the principal. But many of us still want revenge. Do you think she is a mean teacher? And what revenge (if any) should we get on her. No prank calls because the school has caller ID.