Discipline methods that don't work on my class

[xiphias]

Note to self: if a student in your class starts being all sarcastic, going to him and saying, "No dark sarcasm in the classroom!" won't actually help, unless your goal actually WAS to have the entire rest of the class sing large chunks of "The Wall" to the one student who hadn't heard it.

(Sixth and seventh graders -- eleven, twelve years old or so.)